I added a new recipe for sharding web engine tests. The design doc is here: go/web-engine-recipe-drones In this step I'll add a web drone, later I'll add builders for it (to flutter/infra). In the last step I'll change web_engine_recipe to call these shards with built web engine. These changes should solved the infra failures (timeouts) happening quite often on Web builders. Example shard runs: Felt licences: https://luci-milo.appspot.com/raw/build/logs.chromium.org/flutter/led/nurhan_google.com/4d3a9e5cdf82bb21bc52eecffbe3c3cd8259ca71a2589f7f787c020890ae6dcd/+/annotations Felt chrome unit tests windows: https://luci-milo.appspot.com/raw/build/logs.chromium.org/flutter/led/nurhan_google.com/22daa09760618243b78a9804cc04f0060628eb63a6750969968c6aeffdaff2d6/+/annotations Felt chrome integration tests linux: https://luci-milo.appspot.com/raw/build/logs.chromium.org/flutter/led/nurhan_google.com/a87012516c186086e5fa53cac3be1f0772c11e208004ec0f3a82e528e5d9a6af/+/annotations Change-Id: I6ee053e02a40207f47bcdabef120163765262ccb Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/8980 Commit-Queue: Nurhan Turgut <nurhan@google.com> Reviewed-by: Christopher Fujino <fujino@google.com>

commit: 69b3bdb82b5ee2b0adc02c5a9e56abd225c46721 [log] [tgz]
author: Nurhan Turgut <nurhan@google.com> Wed Nov 25 19:59:54 2020 +0000
committer: CQ Bot Account <flutter-scoped@luci-project-accounts.iam.gserviceaccount.com> Wed Nov 25 19:59:54 2020 +0000
tree: 73e6778f66a6d9a5c0b09842fe29ef2922f13839
parent: cad945da45f54562134a9ddc70f47edaa8312d85 [diff]
diff --git a/recipe_modules/web_util/__init__.py b/recipe_modules/web_util/__init__.py
new file mode 100644
index 0000000..93ceba8
--- /dev/null
+++ b/recipe_modules/web_util/__init__.py

@@ -0,0 +1,17 @@
+DEPS = [
+    'depot_tools/gsutil',
+    'depot_tools/git',
+    'flutter/repo_util',
+    'flutter/yaml',
+    'recipe_engine/buildbucket',
+    'recipe_engine/cipd',
+    'recipe_engine/context',
+    'recipe_engine/file',
+    'recipe_engine/isolated',
+    'recipe_engine/json',
+    'recipe_engine/path',
+    'recipe_engine/platform',
+    'recipe_engine/properties',
+    'recipe_engine/runtime',
+    'recipe_engine/step',
+]

diff --git a/recipe_modules/web_util/api.py b/recipe_modules/web_util/api.py
new file mode 100644
index 0000000..e0d4818
--- /dev/null
+++ b/recipe_modules/web_util/api.py

@@ -0,0 +1,173 @@
+# Copyright 2020 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import copy
+from recipe_engine import recipe_api
+
+
+class WebUtilsApi(recipe_api.RecipeApi):
+  """Utilities to use when running flutter web engine tests."""
+
+  def firefox_driver(self, checkout):
+    """Downloads the latest version of the Firefox web driver from CIPD."""
+    # Download the driver for Firefox.
+    firefox_driver_path = checkout.join('flutter', 'lib', 'web_ui',
+                                        '.dart_tool', 'drivers', 'firefox')
+    pkgdriver = self.m.cipd.EnsureFile()
+    pkgdriver.add_package(
+        'flutter_internal/browser-drivers/firefoxdriver-linux', 'latest')
+    self.m.cipd.ensure(firefox_driver_path, pkgdriver)
+
+  def chrome(self, checkout):
+    """Downloads Chrome from CIPD.
+
+    The chrome version to be used will be read from a file on the repo side.
+    """
+    browser_lock_yaml_file = checkout.join('flutter', 'lib', 'web_ui', 'dev',
+                                           'browser_lock.yaml')
+    with self.m.context(cwd=checkout):
+      result = self.m.yaml.read(
+          'read browser lock yaml',
+          browser_lock_yaml_file,
+          self.m.json.output(),
+      )
+      browser_lock_content = result.json.output
+      platform = self.m.platform.name.capitalize()
+      binary = browser_lock_content['chrome'][platform]
+      chrome_path = checkout.join('flutter', 'lib', 'web_ui', '.dart_tool',
+                                  'chrome', '%s' % binary)
+    # Using the binary number since the repos side file uses binary names.
+    # See: flutter/engine/blob/master/lib/web_ui/dev/browser_lock.yaml
+    # Chrome also uses these binary numbers for archiving different versions.
+    chrome_pkg = self.m.cipd.EnsureFile()
+    chrome_pkg.add_package('flutter_internal/browsers/chrome/${platform}',
+                           binary)
+    self.m.cipd.ensure(chrome_path, chrome_pkg)
+
+  def chrome_driver(self, checkout):
+    """Downloads Chrome web driver from CIPD.
+
+    The driver version to be used will be read from a file on the repo side.
+    """
+    # Get driver version from the engine repo.
+    # See: flutter/engine/blob/master/lib/web_ui/dev/browser_lock.yaml
+    browser_lock_yaml_file = checkout.join('flutter', 'lib', 'web_ui', 'dev',
+                                           'browser_lock.yaml')
+    with self.m.context(cwd=checkout):
+      result = self.m.yaml.read(
+          'read browser lock yaml',
+          browser_lock_yaml_file,
+          self.m.json.output(),
+      )
+      browser_lock_content = result.json.output
+      version = browser_lock_content['required_driver_version']['chrome']
+    chrome_driver_path = checkout.join('flutter', 'lib', 'web_ui', '.dart_tool',
+                                       'drivers', 'chrome', '%s' % version)
+    chrome_pkgdriver = self.m.cipd.EnsureFile()
+    chrome_pkgdriver.add_package(
+        'flutter_internal/browser-drivers/chrome/${platform}',
+        'latest-%s' % version)
+    self.m.cipd.ensure(chrome_driver_path, chrome_pkgdriver)
+
+  def clone_goldens_repo(self, checkout):
+    """Clone the repository that keeps golden files.
+
+    The repository name and the reference SHA will be read from a file on the
+    repo side.
+    """
+    builder_root = self.m.path['cache'].join('builder')
+    goldens = builder_root.join('goldens')
+    self.m.file.ensure_directory('mkdir goldens', goldens)
+    golden_yaml_file = checkout.join('flutter', 'lib', 'web_ui', 'dev',
+                                     'goldens_lock.yaml')
+    with self.m.context(cwd=builder_root):
+      # Use golden_lock.yaml file to read url of the goldens repository and
+      # the revision number to checkout.
+      # https://github.com/flutter/engine/blob/master/lib/web_ui/dev/goldens_lock.yaml
+      # This file is used by web engine developers. The engine developers update
+      # the flutter/goldens.git repo when they  need changes. Later change the
+      # revision number on this file.
+      result = self.m.yaml.read(
+          'read yaml',
+          golden_yaml_file,
+          self.m.json.output(),
+      )
+      # The content of the file is expected to be:
+      #
+      # repository: https://github.com/flutter/goldens.git
+      # revision: b6efc75885c23f0b5c485d8bd659ed339feec9ec
+      golden_lock_content = result.json.output
+      repo = golden_lock_content['repository']
+      revision_number = golden_lock_content['revision']
+    with self.m.context(cwd=goldens):
+      self.m.git.checkout(
+          repo,
+          dir_path=goldens,
+          ref=revision_number,
+          recursive=True,
+          set_got_revision=True)
+    golden_files = checkout.join('flutter', 'lib', 'web_ui', '.dart_tool',
+                                 'goldens')
+    self.m.file.copytree('copy goldens', goldens, golden_files)
+
+  def upload_failing_goldens(self, checkout, browser):
+    """Upload the failed goldens files to a gcs bucket.
+
+    Parse the logs to determine which golden tests are failed. Upload expected
+    and actual golden files to a gcs bucket. Display links to html pages where
+    developer can compare actual vs expected images.
+    """
+    logs_path = checkout.join('flutter', 'lib', 'web_ui', '.dart_tool',
+                              'test_results')
+    tests_info_file_path = logs_path.join('info.txt')
+    self.m.file.write_text(
+        'write info file',
+        tests_info_file_path,
+        'tests for %s' % self.m.platform.name,
+        'tests for windows',
+    )
+
+    if not self.m.properties.get(
+        'gcs_goldens_bucket') or self.m.runtime.is_experimental:
+      # This is to avoid trying to upload files when 'gcs_goldens_bucket' is
+      # missing or when running from led.
+      return
+
+    bucket_id = self.m.buildbucket.build.id
+    self.m.gsutil.upload(
+        bucket=self.m.properties['gcs_goldens_bucket'],
+        source=logs_path,
+        dest='%s/%s/%s' % ('web_engine', bucket_id, browser),
+        link_name='archive goldens',
+        args=['-r'],
+        multithreaded=True,
+        name='upload goldens %s' % bucket_id,
+        unauthenticated_url=True)
+    html_files = self.m.file.glob_paths(
+        'html goldens',
+        source=logs_path,
+        pattern='*.html',
+        test_data=['a.html'])
+    with self.m.step.nest('Failed golden links') as presentation:
+      for html_file in html_files:
+        base_name = self.m.path.basename(html_file)
+        url = 'https://storage.googleapis.com/%s/web_engine/%s/%s/%s' % (
+            self.m.properties['gcs_goldens_bucket'], bucket_id, browser,
+            base_name)
+        presentation.links[base_name] = url
+
+  def prepare_dependencies(self, checkout):
+    """Install all the required dependencies for a given felt test."""
+    deps = self.m.properties.get('dependencies', [])
+    available_deps = {
+        'chrome': self.chrome,
+        'chrome_driver': self.chrome_driver,
+        'firefox_driver': self.firefox_driver,
+        'goldens_repo': self.clone_goldens_repo,
+    }
+    for dep in deps:
+      dep_funct = available_deps.get(dep)
+      if not dep_funct:
+        raise ValueError('Dependency %s not available.' % dep)
+      dep_funct(checkout)

diff --git a/recipe_modules/web_util/examples/full.expected/chrome driver.json b/recipe_modules/web_util/examples/full.expected/chrome driver.json
new file mode 100644
index 0000000..02162a5
--- /dev/null
+++ b/recipe_modules/web_util/examples/full.expected/chrome driver.json

@@ -0,0 +1,105 @@
+[
+  {
+    "cmd": [],
+    "name": "read browser lock yaml",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@yaml@@@@",
+      "@@@STEP_LOG_END@yaml@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "[CACHE]/builder/src/flutter/lib/web_ui/dev/browser_lock.yaml",
+      "/path/to/tmp/"
+    ],
+    "cwd": "[CACHE]/builder/src",
+    "infra_step": true,
+    "name": "read browser lock yaml.read",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_END@browser_lock.yaml@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[flutter::yaml]/resources/parse_yaml.py",
+      "--yaml_file",
+      "[CACHE]/builder/src/flutter/lib/web_ui/dev/browser_lock.yaml",
+      "--json_file",
+      "/path/to/tmp/json"
+    ],
+    "cwd": "[CACHE]/builder/src",
+    "name": "read browser lock yaml.parse",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"chrome\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"Linux\": \"768968\", @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"Mac\": \"768985\", @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"Win\": \"768975\"@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"required_driver_version\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"chrome\": 84@@@",
+      "@@@STEP_LOG_LINE@json.output@  }@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "cipd",
+      "ensure",
+      "-root",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/drivers/chrome/84",
+      "-ensure-file",
+      "flutter_internal/browser-drivers/chrome/${platform} latest-84",
+      "-max-threads",
+      "0",
+      "-json-output",
+      "/path/to/tmp/json"
+    ],
+    "name": "ensure_installed",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"result\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"\": [@@@",
+      "@@@STEP_LOG_LINE@json.output@      {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"instance_id\": \"resolved-instance_id-of-latest-84-------\", @@@",
+      "@@@STEP_LOG_LINE@json.output@        \"package\": \"flutter_internal/browser-drivers/chrome/resolved-platform\"@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@STEP_LOG_LINE@json.output@    ]@@@",
+      "@@@STEP_LOG_LINE@json.output@  }@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "tests for linux",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/test_results/info.txt"
+    ],
+    "infra_step": true,
+    "name": "write info file",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@info.txt@tests for linux@@@",
+      "@@@STEP_LOG_END@info.txt@@@"
+    ]
+  },
+  {
+    "name": "$result"
+  }
+]
\ No newline at end of file

diff --git a/recipe_modules/web_util/examples/full.expected/chrome.json b/recipe_modules/web_util/examples/full.expected/chrome.json
new file mode 100644
index 0000000..ca9231b
--- /dev/null
+++ b/recipe_modules/web_util/examples/full.expected/chrome.json

@@ -0,0 +1,105 @@
+[
+  {
+    "cmd": [],
+    "name": "read browser lock yaml",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@yaml@@@@",
+      "@@@STEP_LOG_END@yaml@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "[CACHE]/builder/src/flutter/lib/web_ui/dev/browser_lock.yaml",
+      "/path/to/tmp/"
+    ],
+    "cwd": "[CACHE]/builder/src",
+    "infra_step": true,
+    "name": "read browser lock yaml.read",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_END@browser_lock.yaml@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[flutter::yaml]/resources/parse_yaml.py",
+      "--yaml_file",
+      "[CACHE]/builder/src/flutter/lib/web_ui/dev/browser_lock.yaml",
+      "--json_file",
+      "/path/to/tmp/json"
+    ],
+    "cwd": "[CACHE]/builder/src",
+    "name": "read browser lock yaml.parse",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"chrome\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"Linux\": \"768968\", @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"Mac\": \"768985\", @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"Win\": \"768975\"@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"required_driver_version\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"chrome\": 84@@@",
+      "@@@STEP_LOG_LINE@json.output@  }@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "cipd",
+      "ensure",
+      "-root",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/chrome/768968",
+      "-ensure-file",
+      "flutter_internal/browsers/chrome/${platform} 768968",
+      "-max-threads",
+      "0",
+      "-json-output",
+      "/path/to/tmp/json"
+    ],
+    "name": "ensure_installed",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"result\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"\": [@@@",
+      "@@@STEP_LOG_LINE@json.output@      {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"instance_id\": \"resolved-instance_id-of-768968----------\", @@@",
+      "@@@STEP_LOG_LINE@json.output@        \"package\": \"flutter_internal/browsers/chrome/resolved-platform\"@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@STEP_LOG_LINE@json.output@    ]@@@",
+      "@@@STEP_LOG_LINE@json.output@  }@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "tests for linux",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/test_results/info.txt"
+    ],
+    "infra_step": true,
+    "name": "write info file",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@info.txt@tests for linux@@@",
+      "@@@STEP_LOG_END@info.txt@@@"
+    ]
+  },
+  {
+    "name": "$result"
+  }
+]
\ No newline at end of file

diff --git a/recipe_modules/web_util/examples/full.expected/clone repo.json b/recipe_modules/web_util/examples/full.expected/clone repo.json
new file mode 100644
index 0000000..7eb4fcb
--- /dev/null
+++ b/recipe_modules/web_util/examples/full.expected/clone repo.json

@@ -0,0 +1,233 @@
+[
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0777",
+      "[CACHE]/builder/goldens"
+    ],
+    "infra_step": true,
+    "name": "mkdir goldens"
+  },
+  {
+    "cmd": [],
+    "name": "read yaml",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@yaml@@@@",
+      "@@@STEP_LOG_END@yaml@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "[CACHE]/builder/src/flutter/lib/web_ui/dev/goldens_lock.yaml",
+      "/path/to/tmp/"
+    ],
+    "cwd": "[CACHE]/builder",
+    "infra_step": true,
+    "name": "read yaml.read",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_END@goldens_lock.yaml@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[flutter::yaml]/resources/parse_yaml.py",
+      "--yaml_file",
+      "[CACHE]/builder/src/flutter/lib/web_ui/dev/goldens_lock.yaml",
+      "--json_file",
+      "/path/to/tmp/json"
+    ],
+    "cwd": "[CACHE]/builder",
+    "name": "read yaml.parse",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"repository\": \"repo\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"revision\": \"b6efc758\"@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[depot_tools::git]/resources/git_setup.py",
+      "--path",
+      "[CACHE]/builder/goldens",
+      "--url",
+      "repo"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "name": "git setup"
+  },
+  {
+    "cmd": [
+      "git",
+      "fetch",
+      "origin",
+      "b6efc758",
+      "--recurse-submodules",
+      "--progress"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "env": {
+      "PATH": "RECIPE_REPO[depot_tools]:<PATH>"
+    },
+    "infra_step": true,
+    "name": "git fetch"
+  },
+  {
+    "cmd": [
+      "git",
+      "checkout",
+      "-f",
+      "FETCH_HEAD"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "git checkout"
+  },
+  {
+    "cmd": [
+      "git",
+      "rev-parse",
+      "HEAD"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "read revision",
+    "~followup_annotations": [
+      "@@@STEP_TEXT@<br/>checked out 'deadbeef'<br/>@@@",
+      "@@@SET_BUILD_PROPERTY@got_revision@\"deadbeef\"@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "clean",
+      "-f",
+      "-d",
+      "-x"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "git clean"
+  },
+  {
+    "cmd": [
+      "git",
+      "submodule",
+      "sync"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "submodule sync"
+  },
+  {
+    "cmd": [
+      "git",
+      "submodule",
+      "update",
+      "--init",
+      "--recursive"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "submodule update"
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copytree",
+      "[CACHE]/builder/goldens",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/goldens"
+    ],
+    "infra_step": true,
+    "name": "copy goldens"
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "tests for linux",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/test_results/info.txt"
+    ],
+    "infra_step": true,
+    "name": "write info file",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@info.txt@tests for linux@@@",
+      "@@@STEP_LOG_END@info.txt@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[depot_tools::gsutil]/resources/gsutil_smart_retry.py",
+      "--",
+      "RECIPE_REPO[depot_tools]/gsutil.py",
+      "-m",
+      "----",
+      "cp",
+      "-r",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/test_results",
+      "gs://mybucket/web_engine/0/chrome"
+    ],
+    "infra_step": true,
+    "name": "gsutil upload goldens 0",
+    "~followup_annotations": [
+      "@@@STEP_LINK@archive goldens@https://console.cloud.google.com/storage/browser/mybucket/web_engine/0/chrome@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "glob",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/test_results",
+      "*.html"
+    ],
+    "infra_step": true,
+    "name": "html goldens",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@glob@[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/test_results/a.html@@@",
+      "@@@STEP_LOG_END@glob@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "Failed golden links",
+    "~followup_annotations": [
+      "@@@STEP_LINK@a.html@https://storage.googleapis.com/mybucket/web_engine/0/chrome/a.html@@@"
+    ]
+  },
+  {
+    "name": "$result"
+  }
+]
\ No newline at end of file

diff --git a/recipe_modules/web_util/examples/full.expected/fail case.json b/recipe_modules/web_util/examples/full.expected/fail case.json
new file mode 100644
index 0000000..eede892
--- /dev/null
+++ b/recipe_modules/web_util/examples/full.expected/fail case.json

@@ -0,0 +1,23 @@
+[
+  {
+    "cmd": [],
+    "name": "RECIPE CRASH (Uncaught exception)",
+    "~followup_annotations": [
+      "@@@STEP_EXCEPTION@@@",
+      "The recipe has crashed at point 'Uncaught exception'!",
+      "",
+      "Traceback (most recent call last):",
+      "  File \"RECIPE_REPO[flutter]/recipe_modules/web_util/examples/full.py\", line 23, in RunSteps",
+      "    api.web_util.prepare_dependencies(engine_checkout_path)",
+      "  File \"RECIPE_REPO[flutter]/recipe_modules/web_util/api.py\", line 172, in prepare_dependencies",
+      "    raise ValueError('Dependency %s not available.' % dep)",
+      "ValueError: Dependency invalid_dependency not available."
+    ]
+  },
+  {
+    "failure": {
+      "humanReason": "Uncaught Exception: ValueError('Dependency invalid_dependency not available.',)"
+    },
+    "name": "$result"
+  }
+]
\ No newline at end of file

diff --git a/recipe_modules/web_util/examples/full.expected/firefox driver.json b/recipe_modules/web_util/examples/full.expected/firefox driver.json
new file mode 100644
index 0000000..f214d56
--- /dev/null
+++ b/recipe_modules/web_util/examples/full.expected/firefox driver.json

@@ -0,0 +1,51 @@
+[
+  {
+    "cmd": [
+      "cipd",
+      "ensure",
+      "-root",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/drivers/firefox",
+      "-ensure-file",
+      "flutter_internal/browser-drivers/firefoxdriver-linux latest",
+      "-max-threads",
+      "0",
+      "-json-output",
+      "/path/to/tmp/json"
+    ],
+    "name": "ensure_installed",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"result\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"\": [@@@",
+      "@@@STEP_LOG_LINE@json.output@      {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"instance_id\": \"resolved-instance_id-of-latest----------\", @@@",
+      "@@@STEP_LOG_LINE@json.output@        \"package\": \"flutter_internal/browser-drivers/firefoxdriver-linux\"@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@STEP_LOG_LINE@json.output@    ]@@@",
+      "@@@STEP_LOG_LINE@json.output@  }@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "tests for linux",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/test_results/info.txt"
+    ],
+    "infra_step": true,
+    "name": "write info file",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@info.txt@tests for linux@@@",
+      "@@@STEP_LOG_END@info.txt@@@"
+    ]
+  },
+  {
+    "name": "$result"
+  }
+]
\ No newline at end of file

diff --git a/recipe_modules/web_util/examples/full.expected/mac-post-submit.json b/recipe_modules/web_util/examples/full.expected/mac-post-submit.json
new file mode 100644
index 0000000..edcc8ba
--- /dev/null
+++ b/recipe_modules/web_util/examples/full.expected/mac-post-submit.json

@@ -0,0 +1,233 @@
+[
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0777",
+      "[CACHE]/builder/goldens"
+    ],
+    "infra_step": true,
+    "name": "mkdir goldens"
+  },
+  {
+    "cmd": [],
+    "name": "read yaml",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@yaml@@@@",
+      "@@@STEP_LOG_END@yaml@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "[CACHE]/builder/src/flutter/lib/web_ui/dev/goldens_lock.yaml",
+      "/path/to/tmp/"
+    ],
+    "cwd": "[CACHE]/builder",
+    "infra_step": true,
+    "name": "read yaml.read",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_END@goldens_lock.yaml@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[flutter::yaml]/resources/parse_yaml.py",
+      "--yaml_file",
+      "[CACHE]/builder/src/flutter/lib/web_ui/dev/goldens_lock.yaml",
+      "--json_file",
+      "/path/to/tmp/json"
+    ],
+    "cwd": "[CACHE]/builder",
+    "name": "read yaml.parse",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"repository\": \"repo\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"revision\": \"b6efc758\"@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[depot_tools::git]/resources/git_setup.py",
+      "--path",
+      "[CACHE]/builder/goldens",
+      "--url",
+      "repo"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "name": "git setup"
+  },
+  {
+    "cmd": [
+      "git",
+      "fetch",
+      "origin",
+      "b6efc758",
+      "--recurse-submodules",
+      "--progress"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "env": {
+      "PATH": "RECIPE_REPO[depot_tools]:<PATH>"
+    },
+    "infra_step": true,
+    "name": "git fetch"
+  },
+  {
+    "cmd": [
+      "git",
+      "checkout",
+      "-f",
+      "FETCH_HEAD"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "git checkout"
+  },
+  {
+    "cmd": [
+      "git",
+      "rev-parse",
+      "HEAD"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "read revision",
+    "~followup_annotations": [
+      "@@@STEP_TEXT@<br/>checked out 'deadbeef'<br/>@@@",
+      "@@@SET_BUILD_PROPERTY@got_revision@\"deadbeef\"@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "clean",
+      "-f",
+      "-d",
+      "-x"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "git clean"
+  },
+  {
+    "cmd": [
+      "git",
+      "submodule",
+      "sync"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "submodule sync"
+  },
+  {
+    "cmd": [
+      "git",
+      "submodule",
+      "update",
+      "--init",
+      "--recursive"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "submodule update"
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copytree",
+      "[CACHE]/builder/goldens",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/goldens"
+    ],
+    "infra_step": true,
+    "name": "copy goldens"
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "tests for mac",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/test_results/info.txt"
+    ],
+    "infra_step": true,
+    "name": "write info file",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@info.txt@tests for mac@@@",
+      "@@@STEP_LOG_END@info.txt@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[depot_tools::gsutil]/resources/gsutil_smart_retry.py",
+      "--",
+      "RECIPE_REPO[depot_tools]/gsutil.py",
+      "-m",
+      "----",
+      "cp",
+      "-r",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/test_results",
+      "gs://mybucket/web_engine/0/chrome"
+    ],
+    "infra_step": true,
+    "name": "gsutil upload goldens 0",
+    "~followup_annotations": [
+      "@@@STEP_LINK@archive goldens@https://console.cloud.google.com/storage/browser/mybucket/web_engine/0/chrome@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "glob",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/test_results",
+      "*.html"
+    ],
+    "infra_step": true,
+    "name": "html goldens",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@glob@[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/test_results/a.html@@@",
+      "@@@STEP_LOG_END@glob@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "Failed golden links",
+    "~followup_annotations": [
+      "@@@STEP_LINK@a.html@https://storage.googleapis.com/mybucket/web_engine/0/chrome/a.html@@@"
+    ]
+  },
+  {
+    "name": "$result"
+  }
+]
\ No newline at end of file

diff --git a/recipe_modules/web_util/examples/full.py b/recipe_modules/web_util/examples/full.py
new file mode 100644
index 0000000..6507dc4
--- /dev/null
+++ b/recipe_modules/web_util/examples/full.py

@@ -0,0 +1,79 @@
+# Copyright 2020 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+from recipe_engine.post_process import DoesNotRun, Filter, StatusFailure
+
+DEPS = [
+    'depot_tools/gsutil',
+    'flutter/web_util',
+    'recipe_engine/context',
+    'recipe_engine/file',
+    'recipe_engine/json',
+    'recipe_engine/path',
+    'recipe_engine/platform',
+    'recipe_engine/properties',
+    'recipe_engine/runtime',
+    'recipe_engine/step',
+]
+
+
+def RunSteps(api):
+  engine_checkout_path = api.path['cache'].join('builder', 'src')
+  api.web_util.prepare_dependencies(engine_checkout_path)
+  api.web_util.upload_failing_goldens(engine_checkout_path, 'chrome')
+
+def GenTests(api):
+  golden_yaml_file = {'repository': 'repo', 'revision': 'b6efc758'}
+  browser_yaml_file = {
+      'required_driver_version': {
+          'chrome': 84
+      },
+      'chrome': {
+          'Linux': '768968',
+          'Mac': '768985',
+          'Win': '768975'
+      }
+  }
+  yield api.test(
+      'fail case',
+      api.expect_exception('ValueError'),
+      api.properties(
+          dependencies=['invalid_dependency'],), api.platform(
+              'linux', 64)) + api.platform.name('linux')
+  yield api.test(
+      'clone repo',
+      api.step_data('read yaml.parse', api.json.output(golden_yaml_file)),
+      api.properties(
+          gcs_goldens_bucket='mybucket',
+          dependencies=['goldens_repo'],), api.platform(
+              'linux', 64)) + api.platform.name('linux') + api.runtime(is_experimental=False)
+  yield api.test(
+      'chrome driver',
+      api.step_data('read browser lock yaml.parse',
+                    api.json.output(browser_yaml_file)),
+      api.properties(
+          dependencies=['chrome_driver'],), api.platform(
+              'linux', 64)) + api.platform.name('linux')
+  yield api.test(
+      'firefox driver',
+      api.properties(
+          dependencies=['firefox_driver'],), api.platform(
+              'linux', 64)) + api.platform.name('linux')
+  yield api.test(
+      'chrome',
+      api.step_data('read browser lock yaml.parse',
+                    api.json.output(browser_yaml_file)),
+      api.properties(
+          dependencies=['chrome'],), api.platform(
+              'linux', 64)) + api.platform.name('linux')
+  yield api.test(
+      'mac-post-submit',
+      api.step_data('read yaml.parse', api.json.output(golden_yaml_file)),
+      api.properties(
+          goma_jobs='200',
+          gcs_goldens_bucket='mybucket',
+          dependencies=['goldens_repo'],
+          command_args=['test', '--browser=ios-safari', '--unit-tests-only'],
+          command_name='ios-safari-unit-tests'), api.platform(
+              'mac', 64)) + api.runtime(is_experimental=False)

diff --git a/recipes/engine/web_engine_drone.expected/linux-error.json b/recipes/engine/web_engine_drone.expected/linux-error.json
new file mode 100644
index 0000000..1ef3bf5
--- /dev/null
+++ b/recipes/engine/web_engine_drone.expected/linux-error.json

@@ -0,0 +1,234 @@
+[
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "rmtree",
+      "[CACHE]/builder"
+    ],
+    "infra_step": true,
+    "name": "Clobber cache"
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "rmtree",
+      "[CACHE]/builder/src/out"
+    ],
+    "infra_step": true,
+    "name": "Clobber build output: Linux"
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0777",
+      "[CACHE]/builder"
+    ],
+    "infra_step": true,
+    "name": "Ensure checkout cache"
+  },
+  {
+    "cmd": [],
+    "name": "ensure goma"
+  },
+  {
+    "cmd": [
+      "cipd",
+      "ensure",
+      "-root",
+      "[CACHE]/goma/client",
+      "-ensure-file",
+      "fuchsia/third_party/goma/client/${platform} release",
+      "-max-threads",
+      "0",
+      "-json-output",
+      "/path/to/tmp/json"
+    ],
+    "infra_step": true,
+    "name": "ensure goma.ensure_installed",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"result\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"\": [@@@",
+      "@@@STEP_LOG_LINE@json.output@      {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"instance_id\": \"resolved-instance_id-of-release---------\", @@@",
+      "@@@STEP_LOG_LINE@json.output@        \"package\": \"fuchsia/third_party/goma/client/resolved-platform\"@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@STEP_LOG_LINE@json.output@    ]@@@",
+      "@@@STEP_LOG_LINE@json.output@  }@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "Checkout source code"
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "rmtree",
+      "[CACHE]/builder"
+    ],
+    "infra_step": true,
+    "name": "Checkout source code.Clobber cache",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0777",
+      "[CACHE]/builder"
+    ],
+    "infra_step": true,
+    "name": "Checkout source code.Ensure checkout cache",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
+      "--spec-path",
+      "cache_dir = '[CACHE]/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'src/flutter', 'url': 'https://mygitrepo'}]",
+      "--revision_mapping_file",
+      "{\"got_engine_revision\": \"src/flutter\"}",
+      "--git-cache-dir",
+      "[CACHE]/git",
+      "--cleanup-dir",
+      "[CLEANUP]/bot_update",
+      "--output_json",
+      "/path/to/tmp/json",
+      "--revision",
+      "src/flutter@refs/pull/1/head",
+      "--refs",
+      "refs/pull/1/head"
+    ],
+    "cwd": "[CACHE]/builder",
+    "env": {
+      "GIT_HTTP_LOW_SPEED_LIMIT": "102400",
+      "GIT_HTTP_LOW_SPEED_TIME": "300"
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "name": "Checkout source code.bot_update",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_TEXT@Some step text@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"did_run\": true, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"fixed_revisions\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"src/flutter\": \"refs/pull/1/head\"@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"manifest\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"src/flutter\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"repository\": \"https://fake.org/src/flutter.git\", @@@",
+      "@@@STEP_LOG_LINE@json.output@      \"revision\": \"a63681edc0f69a72604596b16c7986513e809995\"@@@",
+      "@@@STEP_LOG_LINE@json.output@    }@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"patch_failure\": false, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"patch_root\": \"src/flutter\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"properties\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"got_engine_revision\": \"a63681edc0f69a72604596b16c7986513e809995\", @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"got_engine_revision_cp\": \"refs/heads/master@{#84512}\"@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"root\": \"src/flutter\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"source_manifest\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"directories\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"src/flutter\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"git_checkout\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@          \"repo_url\": \"https://fake.org/src/flutter.git\", @@@",
+      "@@@STEP_LOG_LINE@json.output@          \"revision\": \"a63681edc0f69a72604596b16c7986513e809995\"@@@",
+      "@@@STEP_LOG_LINE@json.output@        }@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@STEP_LOG_LINE@json.output@    }, @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"version\": 0@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"step_text\": \"Some step text\"@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@",
+      "@@@SET_BUILD_PROPERTY@got_engine_revision@\"a63681edc0f69a72604596b16c7986513e809995\"@@@",
+      "@@@SET_BUILD_PROPERTY@got_engine_revision_cp@\"refs/heads/master@{#84512}\"@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_REPO[depot_tools]/gclient.py",
+      "runhooks"
+    ],
+    "cwd": "[CACHE]/builder",
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Checkout source code.gclient runhooks",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "RECIPE CRASH (Uncaught exception)",
+    "~followup_annotations": [
+      "@@@STEP_EXCEPTION@@@",
+      "The recipe has crashed at point 'Uncaught exception'!",
+      "",
+      "Traceback (most recent call last):",
+      "  File \"RECIPE_REPO[flutter]/recipes/engine/web_engine_drone.py\", line 75, in RunSteps",
+      "    api.web_util.prepare_dependencies(checkout)",
+      "  File \"RECIPE_REPO[flutter]/recipe_modules/web_util/api.py\", line 172, in prepare_dependencies",
+      "    raise ValueError('Dependency %s not available.' % dep)",
+      "ValueError: Dependency invalid_dependency not available."
+    ]
+  },
+  {
+    "failure": {
+      "humanReason": "Uncaught Exception: ValueError('Dependency invalid_dependency not available.',)"
+    },
+    "name": "$result"
+  }
+]
\ No newline at end of file

diff --git a/recipes/engine/web_engine_drone.expected/linux-experimental.json b/recipes/engine/web_engine_drone.expected/linux-experimental.json
new file mode 100644
index 0000000..2569944
--- /dev/null
+++ b/recipes/engine/web_engine_drone.expected/linux-experimental.json

@@ -0,0 +1,706 @@
+[
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "rmtree",
+      "[CACHE]/builder"
+    ],
+    "infra_step": true,
+    "name": "Clobber cache"
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "rmtree",
+      "[CACHE]/builder/src/out"
+    ],
+    "infra_step": true,
+    "name": "Clobber build output: Linux"
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0777",
+      "[CACHE]/builder"
+    ],
+    "infra_step": true,
+    "name": "Ensure checkout cache"
+  },
+  {
+    "cmd": [],
+    "name": "ensure goma"
+  },
+  {
+    "cmd": [
+      "cipd",
+      "ensure",
+      "-root",
+      "[CACHE]/goma/client",
+      "-ensure-file",
+      "fuchsia/third_party/goma/client/${platform} release",
+      "-max-threads",
+      "0",
+      "-json-output",
+      "/path/to/tmp/json"
+    ],
+    "infra_step": true,
+    "name": "ensure goma.ensure_installed",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"result\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"\": [@@@",
+      "@@@STEP_LOG_LINE@json.output@      {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"instance_id\": \"resolved-instance_id-of-release---------\", @@@",
+      "@@@STEP_LOG_LINE@json.output@        \"package\": \"fuchsia/third_party/goma/client/resolved-platform\"@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@STEP_LOG_LINE@json.output@    ]@@@",
+      "@@@STEP_LOG_LINE@json.output@  }@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "Checkout source code"
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "rmtree",
+      "[CACHE]/builder"
+    ],
+    "infra_step": true,
+    "name": "Checkout source code.Clobber cache",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0777",
+      "[CACHE]/builder"
+    ],
+    "infra_step": true,
+    "name": "Checkout source code.Ensure checkout cache",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
+      "--spec-path",
+      "cache_dir = '[CACHE]/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'src/flutter', 'url': 'https://mygitrepo'}]",
+      "--revision_mapping_file",
+      "{\"got_engine_revision\": \"src/flutter\"}",
+      "--git-cache-dir",
+      "[CACHE]/git",
+      "--cleanup-dir",
+      "[CLEANUP]/bot_update",
+      "--output_json",
+      "/path/to/tmp/json",
+      "--revision",
+      "src/flutter@refs/pull/1/head",
+      "--refs",
+      "refs/pull/1/head"
+    ],
+    "cwd": "[CACHE]/builder",
+    "env": {
+      "GIT_HTTP_LOW_SPEED_LIMIT": "102400",
+      "GIT_HTTP_LOW_SPEED_TIME": "300"
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "name": "Checkout source code.bot_update",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_TEXT@Some step text@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"did_run\": true, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"fixed_revisions\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"src/flutter\": \"refs/pull/1/head\"@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"manifest\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"src/flutter\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"repository\": \"https://fake.org/src/flutter.git\", @@@",
+      "@@@STEP_LOG_LINE@json.output@      \"revision\": \"a63681edc0f69a72604596b16c7986513e809995\"@@@",
+      "@@@STEP_LOG_LINE@json.output@    }@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"patch_failure\": false, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"patch_root\": \"src/flutter\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"properties\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"got_engine_revision\": \"a63681edc0f69a72604596b16c7986513e809995\", @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"got_engine_revision_cp\": \"refs/heads/master@{#84512}\"@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"root\": \"src/flutter\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"source_manifest\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"directories\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"src/flutter\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"git_checkout\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@          \"repo_url\": \"https://fake.org/src/flutter.git\", @@@",
+      "@@@STEP_LOG_LINE@json.output@          \"revision\": \"a63681edc0f69a72604596b16c7986513e809995\"@@@",
+      "@@@STEP_LOG_LINE@json.output@        }@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@STEP_LOG_LINE@json.output@    }, @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"version\": 0@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"step_text\": \"Some step text\"@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@",
+      "@@@SET_BUILD_PROPERTY@got_engine_revision@\"a63681edc0f69a72604596b16c7986513e809995\"@@@",
+      "@@@SET_BUILD_PROPERTY@got_engine_revision_cp@\"refs/heads/master@{#84512}\"@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_REPO[depot_tools]/gclient.py",
+      "runhooks"
+    ],
+    "cwd": "[CACHE]/builder",
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Checkout source code.gclient runhooks",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0777",
+      "[CACHE]/builder/goldens"
+    ],
+    "infra_step": true,
+    "name": "mkdir goldens"
+  },
+  {
+    "cmd": [],
+    "name": "read yaml",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@yaml@@@@",
+      "@@@STEP_LOG_END@yaml@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "[CACHE]/builder/src/flutter/lib/web_ui/dev/goldens_lock.yaml",
+      "/path/to/tmp/"
+    ],
+    "cwd": "[CACHE]/builder",
+    "infra_step": true,
+    "name": "read yaml.read",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_END@goldens_lock.yaml@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[flutter::yaml]/resources/parse_yaml.py",
+      "--yaml_file",
+      "[CACHE]/builder/src/flutter/lib/web_ui/dev/goldens_lock.yaml",
+      "--json_file",
+      "/path/to/tmp/json"
+    ],
+    "cwd": "[CACHE]/builder",
+    "name": "read yaml.parse",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"repository\": \"repo\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"revision\": \"b6efc758\"@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[depot_tools::git]/resources/git_setup.py",
+      "--path",
+      "[CACHE]/builder/goldens",
+      "--url",
+      "repo"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "name": "git setup"
+  },
+  {
+    "cmd": [
+      "git",
+      "fetch",
+      "origin",
+      "b6efc758",
+      "--recurse-submodules",
+      "--progress"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "env": {
+      "PATH": "RECIPE_REPO[depot_tools]:<PATH>"
+    },
+    "infra_step": true,
+    "name": "git fetch"
+  },
+  {
+    "cmd": [
+      "git",
+      "checkout",
+      "-f",
+      "FETCH_HEAD"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "git checkout"
+  },
+  {
+    "cmd": [
+      "git",
+      "rev-parse",
+      "HEAD"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "read revision",
+    "~followup_annotations": [
+      "@@@STEP_TEXT@<br/>checked out 'deadbeef'<br/>@@@",
+      "@@@SET_BUILD_PROPERTY@got_revision@\"deadbeef\"@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "clean",
+      "-f",
+      "-d",
+      "-x"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "git clean"
+  },
+  {
+    "cmd": [
+      "git",
+      "submodule",
+      "sync"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "submodule sync"
+  },
+  {
+    "cmd": [
+      "git",
+      "submodule",
+      "update",
+      "--init",
+      "--recursive"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "submodule update"
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copytree",
+      "[CACHE]/builder/goldens",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/goldens"
+    ],
+    "infra_step": true,
+    "name": "copy goldens"
+  },
+  {
+    "cmd": [
+      "[CACHE]/builder/src/out/host_debug_unopt/dart-sdk/bin/pub",
+      "get"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/web_sdk/web_engine_tester",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "pub get in web_engine_tester"
+  },
+  {
+    "cmd": [
+      "[CACHE]/builder/src/out/host_debug_unopt/dart-sdk/bin/pub",
+      "get"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "pub get in web_ui"
+  },
+  {
+    "cmd": [
+      "[CACHE]/builder/src/out/host_debug_unopt/dart-sdk/bin/dart",
+      "dev/felt.dart",
+      "test"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "felt test: test"
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "tests for linux",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/test_results/info.txt"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "name": "write info file",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@info.txt@tests for linux@@@",
+      "@@@STEP_LOG_END@info.txt@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "Killing Processes"
+  },
+  {
+    "cmd": [
+      "pkill",
+      "chrome"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Killing Processes.kill chrome",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "pkill",
+      "dart"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Killing Processes.kill dart",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "pkill",
+      "flutter"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Killing Processes.kill flutter",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "pkill",
+      "java"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Killing Processes.kill java",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "pkill",
+      "adb"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Killing Processes.kill adb",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "top",
+      "-b",
+      "-n",
+      "3",
+      "-o",
+      "%MEM"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "OS info"
+  },
+  {
+    "name": "$result"
+  }
+]
\ No newline at end of file

diff --git a/recipes/engine/web_engine_drone.expected/linux-firefox-integration.json b/recipes/engine/web_engine_drone.expected/linux-firefox-integration.json
new file mode 100644
index 0000000..e4e7d16
--- /dev/null
+++ b/recipes/engine/web_engine_drone.expected/linux-firefox-integration.json

@@ -0,0 +1,810 @@
+[
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "rmtree",
+      "[CACHE]/builder/src/out"
+    ],
+    "infra_step": true,
+    "name": "Clobber build output: Linux"
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0777",
+      "[CACHE]/builder"
+    ],
+    "infra_step": true,
+    "name": "Ensure checkout cache"
+  },
+  {
+    "cmd": [],
+    "name": "ensure goma"
+  },
+  {
+    "cmd": [
+      "cipd",
+      "ensure",
+      "-root",
+      "[CACHE]/goma/client",
+      "-ensure-file",
+      "fuchsia/third_party/goma/client/${platform} release",
+      "-max-threads",
+      "0",
+      "-json-output",
+      "/path/to/tmp/json"
+    ],
+    "infra_step": true,
+    "name": "ensure goma.ensure_installed",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"result\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"\": [@@@",
+      "@@@STEP_LOG_LINE@json.output@      {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"instance_id\": \"resolved-instance_id-of-release---------\", @@@",
+      "@@@STEP_LOG_LINE@json.output@        \"package\": \"fuchsia/third_party/goma/client/resolved-platform\"@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@STEP_LOG_LINE@json.output@    ]@@@",
+      "@@@STEP_LOG_LINE@json.output@  }@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "Checkout source code"
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "rmtree",
+      "[CACHE]/builder"
+    ],
+    "infra_step": true,
+    "name": "Checkout source code.Clobber cache",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0777",
+      "[CACHE]/builder"
+    ],
+    "infra_step": true,
+    "name": "Checkout source code.Ensure checkout cache",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
+      "--spec-path",
+      "cache_dir = '[CACHE]/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'src/flutter', 'url': 'https://chromium.googlesource.com/external/github.com/flutter/engine'}]",
+      "--revision_mapping_file",
+      "{\"got_engine_revision\": \"src/flutter\"}",
+      "--git-cache-dir",
+      "[CACHE]/git",
+      "--cleanup-dir",
+      "[CLEANUP]/bot_update",
+      "--output_json",
+      "/path/to/tmp/json",
+      "--revision",
+      "src/flutter@HEAD"
+    ],
+    "cwd": "[CACHE]/builder",
+    "env": {
+      "GIT_HTTP_LOW_SPEED_LIMIT": "102400",
+      "GIT_HTTP_LOW_SPEED_TIME": "300"
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "name": "Checkout source code.bot_update",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_TEXT@Some step text@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"did_run\": true, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"fixed_revisions\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"src/flutter\": \"HEAD\"@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"manifest\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"src/flutter\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"repository\": \"https://fake.org/src/flutter.git\", @@@",
+      "@@@STEP_LOG_LINE@json.output@      \"revision\": \"9221bca00ddbd888260084def81f09543281b952\"@@@",
+      "@@@STEP_LOG_LINE@json.output@    }@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"patch_failure\": false, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"patch_root\": \"src/flutter\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"properties\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"got_engine_revision\": \"9221bca00ddbd888260084def81f09543281b952\", @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"got_engine_revision_cp\": \"refs/heads/master@{#84512}\"@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"root\": \"src/flutter\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"source_manifest\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"directories\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"src/flutter\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"git_checkout\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@          \"repo_url\": \"https://fake.org/src/flutter.git\", @@@",
+      "@@@STEP_LOG_LINE@json.output@          \"revision\": \"9221bca00ddbd888260084def81f09543281b952\"@@@",
+      "@@@STEP_LOG_LINE@json.output@        }@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@STEP_LOG_LINE@json.output@    }, @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"version\": 0@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"step_text\": \"Some step text\"@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@",
+      "@@@SET_BUILD_PROPERTY@got_engine_revision@\"9221bca00ddbd888260084def81f09543281b952\"@@@",
+      "@@@SET_BUILD_PROPERTY@got_engine_revision_cp@\"refs/heads/master@{#84512}\"@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_REPO[depot_tools]/gclient.py",
+      "runhooks"
+    ],
+    "cwd": "[CACHE]/builder",
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Checkout source code.gclient runhooks",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "cipd",
+      "ensure",
+      "-root",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/drivers/firefox",
+      "-ensure-file",
+      "flutter_internal/browser-drivers/firefoxdriver-linux latest",
+      "-max-threads",
+      "0",
+      "-json-output",
+      "/path/to/tmp/json"
+    ],
+    "name": "ensure_installed",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"result\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"\": [@@@",
+      "@@@STEP_LOG_LINE@json.output@      {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"instance_id\": \"resolved-instance_id-of-latest----------\", @@@",
+      "@@@STEP_LOG_LINE@json.output@        \"package\": \"flutter_internal/browser-drivers/firefoxdriver-linux\"@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@STEP_LOG_LINE@json.output@    ]@@@",
+      "@@@STEP_LOG_LINE@json.output@  }@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0777",
+      "[CACHE]/builder/goldens"
+    ],
+    "infra_step": true,
+    "name": "mkdir goldens"
+  },
+  {
+    "cmd": [],
+    "name": "read yaml",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@yaml@@@@",
+      "@@@STEP_LOG_END@yaml@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "[CACHE]/builder/src/flutter/lib/web_ui/dev/goldens_lock.yaml",
+      "/path/to/tmp/"
+    ],
+    "cwd": "[CACHE]/builder",
+    "infra_step": true,
+    "name": "read yaml.read",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_END@goldens_lock.yaml@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[flutter::yaml]/resources/parse_yaml.py",
+      "--yaml_file",
+      "[CACHE]/builder/src/flutter/lib/web_ui/dev/goldens_lock.yaml",
+      "--json_file",
+      "/path/to/tmp/json"
+    ],
+    "cwd": "[CACHE]/builder",
+    "name": "read yaml.parse",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"repository\": \"repo\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"revision\": \"b6efc758\"@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[depot_tools::git]/resources/git_setup.py",
+      "--path",
+      "[CACHE]/builder/goldens",
+      "--url",
+      "repo"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "name": "git setup"
+  },
+  {
+    "cmd": [
+      "git",
+      "fetch",
+      "origin",
+      "b6efc758",
+      "--recurse-submodules",
+      "--progress"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "env": {
+      "PATH": "RECIPE_REPO[depot_tools]:<PATH>"
+    },
+    "infra_step": true,
+    "name": "git fetch"
+  },
+  {
+    "cmd": [
+      "git",
+      "checkout",
+      "-f",
+      "FETCH_HEAD"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "git checkout"
+  },
+  {
+    "cmd": [
+      "git",
+      "rev-parse",
+      "HEAD"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "read revision",
+    "~followup_annotations": [
+      "@@@STEP_TEXT@<br/>checked out 'deadbeef'<br/>@@@",
+      "@@@SET_BUILD_PROPERTY@got_revision@\"deadbeef\"@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "clean",
+      "-f",
+      "-d",
+      "-x"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "git clean"
+  },
+  {
+    "cmd": [
+      "git",
+      "submodule",
+      "sync"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "submodule sync"
+  },
+  {
+    "cmd": [
+      "git",
+      "submodule",
+      "update",
+      "--init",
+      "--recursive"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "submodule update"
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copytree",
+      "[CACHE]/builder/goldens",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/goldens"
+    ],
+    "infra_step": true,
+    "name": "copy goldens"
+  },
+  {
+    "cmd": [
+      "[CACHE]/builder/src/out/host_debug_unopt/dart-sdk/bin/pub",
+      "get"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/web_sdk/web_engine_tester",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "pub get in web_engine_tester"
+  },
+  {
+    "cmd": [
+      "[CACHE]/builder/src/out/host_debug_unopt/dart-sdk/bin/pub",
+      "get"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "pub get in web_ui"
+  },
+  {
+    "cmd": [
+      "[CACHE]/builder/src/out/host_debug_unopt/dart-sdk/bin/dart",
+      "dev/felt.dart",
+      "test",
+      "--browser=firefox",
+      "--integration-tests-only"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "felt test: firefox-integration-tests"
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "tests for linux",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/test_results/info.txt"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "name": "write info file",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@info.txt@tests for linux@@@",
+      "@@@STEP_LOG_END@info.txt@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[depot_tools::gsutil]/resources/gsutil_smart_retry.py",
+      "--",
+      "RECIPE_REPO[depot_tools]/gsutil.py",
+      "-m",
+      "----",
+      "cp",
+      "-r",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/test_results",
+      "gs://mybucket/web_engine/0/chrome"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "name": "gsutil upload goldens 0",
+    "~followup_annotations": [
+      "@@@STEP_LINK@archive goldens@https://console.cloud.google.com/storage/browser/mybucket/web_engine/0/chrome@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "glob",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/test_results",
+      "*.html"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "name": "html goldens",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@glob@[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/test_results/a.html@@@",
+      "@@@STEP_LOG_END@glob@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "Failed golden links",
+    "~followup_annotations": [
+      "@@@STEP_LINK@a.html@https://storage.googleapis.com/mybucket/web_engine/0/chrome/a.html@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "Killing Processes"
+  },
+  {
+    "cmd": [
+      "pkill",
+      "chrome"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Killing Processes.kill chrome",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "pkill",
+      "dart"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Killing Processes.kill dart",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "pkill",
+      "flutter"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Killing Processes.kill flutter",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "pkill",
+      "java"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Killing Processes.kill java",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "pkill",
+      "adb"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Killing Processes.kill adb",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "top",
+      "-b",
+      "-n",
+      "3",
+      "-o",
+      "%MEM"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "OS info"
+  },
+  {
+    "name": "$result"
+  }
+]
\ No newline at end of file

diff --git a/recipes/engine/web_engine_drone.expected/linux-post-submit.json b/recipes/engine/web_engine_drone.expected/linux-post-submit.json
new file mode 100644
index 0000000..5af915d
--- /dev/null
+++ b/recipes/engine/web_engine_drone.expected/linux-post-submit.json

@@ -0,0 +1,946 @@
+[
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "rmtree",
+      "[CACHE]/builder/src/out"
+    ],
+    "infra_step": true,
+    "name": "Clobber build output: Linux"
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0777",
+      "[CACHE]/builder"
+    ],
+    "infra_step": true,
+    "name": "Ensure checkout cache"
+  },
+  {
+    "cmd": [],
+    "name": "ensure goma"
+  },
+  {
+    "cmd": [
+      "cipd",
+      "ensure",
+      "-root",
+      "[CACHE]/goma/client",
+      "-ensure-file",
+      "fuchsia/third_party/goma/client/${platform} release",
+      "-max-threads",
+      "0",
+      "-json-output",
+      "/path/to/tmp/json"
+    ],
+    "infra_step": true,
+    "name": "ensure goma.ensure_installed",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"result\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"\": [@@@",
+      "@@@STEP_LOG_LINE@json.output@      {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"instance_id\": \"resolved-instance_id-of-release---------\", @@@",
+      "@@@STEP_LOG_LINE@json.output@        \"package\": \"fuchsia/third_party/goma/client/resolved-platform\"@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@STEP_LOG_LINE@json.output@    ]@@@",
+      "@@@STEP_LOG_LINE@json.output@  }@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "Checkout source code"
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "rmtree",
+      "[CACHE]/builder"
+    ],
+    "infra_step": true,
+    "name": "Checkout source code.Clobber cache",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0777",
+      "[CACHE]/builder"
+    ],
+    "infra_step": true,
+    "name": "Checkout source code.Ensure checkout cache",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
+      "--spec-path",
+      "cache_dir = '[CACHE]/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'src/flutter', 'url': 'https://chromium.googlesource.com/external/github.com/flutter/engine'}]",
+      "--revision_mapping_file",
+      "{\"got_engine_revision\": \"src/flutter\"}",
+      "--git-cache-dir",
+      "[CACHE]/git",
+      "--cleanup-dir",
+      "[CLEANUP]/bot_update",
+      "--output_json",
+      "/path/to/tmp/json",
+      "--revision",
+      "src/flutter@HEAD"
+    ],
+    "cwd": "[CACHE]/builder",
+    "env": {
+      "GIT_HTTP_LOW_SPEED_LIMIT": "102400",
+      "GIT_HTTP_LOW_SPEED_TIME": "300"
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "name": "Checkout source code.bot_update",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_TEXT@Some step text@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"did_run\": true, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"fixed_revisions\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"src/flutter\": \"HEAD\"@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"manifest\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"src/flutter\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"repository\": \"https://fake.org/src/flutter.git\", @@@",
+      "@@@STEP_LOG_LINE@json.output@      \"revision\": \"9221bca00ddbd888260084def81f09543281b952\"@@@",
+      "@@@STEP_LOG_LINE@json.output@    }@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"patch_failure\": false, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"patch_root\": \"src/flutter\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"properties\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"got_engine_revision\": \"9221bca00ddbd888260084def81f09543281b952\", @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"got_engine_revision_cp\": \"refs/heads/master@{#84512}\"@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"root\": \"src/flutter\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"source_manifest\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"directories\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"src/flutter\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"git_checkout\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@          \"repo_url\": \"https://fake.org/src/flutter.git\", @@@",
+      "@@@STEP_LOG_LINE@json.output@          \"revision\": \"9221bca00ddbd888260084def81f09543281b952\"@@@",
+      "@@@STEP_LOG_LINE@json.output@        }@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@STEP_LOG_LINE@json.output@    }, @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"version\": 0@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"step_text\": \"Some step text\"@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@",
+      "@@@SET_BUILD_PROPERTY@got_engine_revision@\"9221bca00ddbd888260084def81f09543281b952\"@@@",
+      "@@@SET_BUILD_PROPERTY@got_engine_revision_cp@\"refs/heads/master@{#84512}\"@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_REPO[depot_tools]/gclient.py",
+      "runhooks"
+    ],
+    "cwd": "[CACHE]/builder",
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Checkout source code.gclient runhooks",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "read browser lock yaml",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@yaml@@@@",
+      "@@@STEP_LOG_END@yaml@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "[CACHE]/builder/src/flutter/lib/web_ui/dev/browser_lock.yaml",
+      "/path/to/tmp/"
+    ],
+    "cwd": "[CACHE]/builder/src",
+    "infra_step": true,
+    "name": "read browser lock yaml.read",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_END@browser_lock.yaml@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[flutter::yaml]/resources/parse_yaml.py",
+      "--yaml_file",
+      "[CACHE]/builder/src/flutter/lib/web_ui/dev/browser_lock.yaml",
+      "--json_file",
+      "/path/to/tmp/json"
+    ],
+    "cwd": "[CACHE]/builder/src",
+    "name": "read browser lock yaml.parse",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"chrome\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"Linux\": \"768968\", @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"Mac\": \"768985\", @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"Win\": \"768975\"@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"required_driver_version\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"chrome\": 84@@@",
+      "@@@STEP_LOG_LINE@json.output@  }@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "cipd",
+      "ensure",
+      "-root",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/drivers/chrome/84",
+      "-ensure-file",
+      "flutter_internal/browser-drivers/chrome/${platform} latest-84",
+      "-max-threads",
+      "0",
+      "-json-output",
+      "/path/to/tmp/json"
+    ],
+    "name": "ensure_installed",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"result\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"\": [@@@",
+      "@@@STEP_LOG_LINE@json.output@      {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"instance_id\": \"resolved-instance_id-of-latest-84-------\", @@@",
+      "@@@STEP_LOG_LINE@json.output@        \"package\": \"flutter_internal/browser-drivers/chrome/resolved-platform\"@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@STEP_LOG_LINE@json.output@    ]@@@",
+      "@@@STEP_LOG_LINE@json.output@  }@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "read browser lock yaml (2)",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@yaml@@@@",
+      "@@@STEP_LOG_END@yaml@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "[CACHE]/builder/src/flutter/lib/web_ui/dev/browser_lock.yaml",
+      "/path/to/tmp/"
+    ],
+    "cwd": "[CACHE]/builder/src",
+    "infra_step": true,
+    "name": "read browser lock yaml (2).read",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_END@browser_lock.yaml@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[flutter::yaml]/resources/parse_yaml.py",
+      "--yaml_file",
+      "[CACHE]/builder/src/flutter/lib/web_ui/dev/browser_lock.yaml",
+      "--json_file",
+      "/path/to/tmp/json"
+    ],
+    "cwd": "[CACHE]/builder/src",
+    "name": "read browser lock yaml (2).parse",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"chrome\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"Linux\": \"768968\", @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"Mac\": \"768985\", @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"Win\": \"768975\"@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"required_driver_version\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"chrome\": 84@@@",
+      "@@@STEP_LOG_LINE@json.output@  }@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "cipd",
+      "ensure",
+      "-root",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/chrome/768968",
+      "-ensure-file",
+      "flutter_internal/browsers/chrome/${platform} 768968",
+      "-max-threads",
+      "0",
+      "-json-output",
+      "/path/to/tmp/json"
+    ],
+    "name": "ensure_installed (2)",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"result\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"\": [@@@",
+      "@@@STEP_LOG_LINE@json.output@      {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"instance_id\": \"resolved-instance_id-of-768968----------\", @@@",
+      "@@@STEP_LOG_LINE@json.output@        \"package\": \"flutter_internal/browsers/chrome/resolved-platform\"@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@STEP_LOG_LINE@json.output@    ]@@@",
+      "@@@STEP_LOG_LINE@json.output@  }@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0777",
+      "[CACHE]/builder/goldens"
+    ],
+    "infra_step": true,
+    "name": "mkdir goldens"
+  },
+  {
+    "cmd": [],
+    "name": "read yaml",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@yaml@@@@",
+      "@@@STEP_LOG_END@yaml@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "[CACHE]/builder/src/flutter/lib/web_ui/dev/goldens_lock.yaml",
+      "/path/to/tmp/"
+    ],
+    "cwd": "[CACHE]/builder",
+    "infra_step": true,
+    "name": "read yaml.read",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_END@goldens_lock.yaml@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[flutter::yaml]/resources/parse_yaml.py",
+      "--yaml_file",
+      "[CACHE]/builder/src/flutter/lib/web_ui/dev/goldens_lock.yaml",
+      "--json_file",
+      "/path/to/tmp/json"
+    ],
+    "cwd": "[CACHE]/builder",
+    "name": "read yaml.parse",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"repository\": \"repo\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"revision\": \"b6efc758\"@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[depot_tools::git]/resources/git_setup.py",
+      "--path",
+      "[CACHE]/builder/goldens",
+      "--url",
+      "repo"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "name": "git setup"
+  },
+  {
+    "cmd": [
+      "git",
+      "fetch",
+      "origin",
+      "b6efc758",
+      "--recurse-submodules",
+      "--progress"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "env": {
+      "PATH": "RECIPE_REPO[depot_tools]:<PATH>"
+    },
+    "infra_step": true,
+    "name": "git fetch"
+  },
+  {
+    "cmd": [
+      "git",
+      "checkout",
+      "-f",
+      "FETCH_HEAD"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "git checkout"
+  },
+  {
+    "cmd": [
+      "git",
+      "rev-parse",
+      "HEAD"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "read revision",
+    "~followup_annotations": [
+      "@@@STEP_TEXT@<br/>checked out 'deadbeef'<br/>@@@",
+      "@@@SET_BUILD_PROPERTY@got_revision@\"deadbeef\"@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "clean",
+      "-f",
+      "-d",
+      "-x"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "git clean"
+  },
+  {
+    "cmd": [
+      "git",
+      "submodule",
+      "sync"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "submodule sync"
+  },
+  {
+    "cmd": [
+      "git",
+      "submodule",
+      "update",
+      "--init",
+      "--recursive"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "submodule update"
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copytree",
+      "[CACHE]/builder/goldens",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/goldens"
+    ],
+    "infra_step": true,
+    "name": "copy goldens"
+  },
+  {
+    "cmd": [
+      "[CACHE]/builder/src/out/host_debug_unopt/dart-sdk/bin/pub",
+      "get"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/web_sdk/web_engine_tester",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "pub get in web_engine_tester"
+  },
+  {
+    "cmd": [
+      "[CACHE]/builder/src/out/host_debug_unopt/dart-sdk/bin/pub",
+      "get"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "pub get in web_ui"
+  },
+  {
+    "cmd": [
+      "[CACHE]/builder/src/out/host_debug_unopt/dart-sdk/bin/dart",
+      "dev/felt.dart",
+      "test",
+      "--browser=chrome",
+      "--integration-tests-only"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "felt test: chrome-integration-tests"
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "tests for linux",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/test_results/info.txt"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "name": "write info file",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@info.txt@tests for linux@@@",
+      "@@@STEP_LOG_END@info.txt@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[depot_tools::gsutil]/resources/gsutil_smart_retry.py",
+      "--",
+      "RECIPE_REPO[depot_tools]/gsutil.py",
+      "-m",
+      "----",
+      "cp",
+      "-r",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/test_results",
+      "gs://mybucket/web_engine/0/chrome"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "name": "gsutil upload goldens 0",
+    "~followup_annotations": [
+      "@@@STEP_LINK@archive goldens@https://console.cloud.google.com/storage/browser/mybucket/web_engine/0/chrome@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "glob",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/test_results",
+      "*.html"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "name": "html goldens",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@glob@[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/test_results/a.html@@@",
+      "@@@STEP_LOG_END@glob@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "Failed golden links",
+    "~followup_annotations": [
+      "@@@STEP_LINK@a.html@https://storage.googleapis.com/mybucket/web_engine/0/chrome/a.html@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "Killing Processes"
+  },
+  {
+    "cmd": [
+      "pkill",
+      "chrome"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Killing Processes.kill chrome",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "pkill",
+      "dart"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Killing Processes.kill dart",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "pkill",
+      "flutter"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Killing Processes.kill flutter",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "pkill",
+      "java"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Killing Processes.kill java",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "pkill",
+      "adb"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Killing Processes.kill adb",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "top",
+      "-b",
+      "-n",
+      "3",
+      "-o",
+      "%MEM"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "OS info"
+  },
+  {
+    "name": "$result"
+  }
+]
\ No newline at end of file

diff --git a/recipes/engine/web_engine_drone.expected/mac-post-submit.json b/recipes/engine/web_engine_drone.expected/mac-post-submit.json
new file mode 100644
index 0000000..05468f6
--- /dev/null
+++ b/recipes/engine/web_engine_drone.expected/mac-post-submit.json

@@ -0,0 +1,969 @@
+[
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "rmtree",
+      "[CACHE]/builder/src/out"
+    ],
+    "infra_step": true,
+    "name": "Clobber build output: Mac"
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0777",
+      "[CACHE]/builder"
+    ],
+    "infra_step": true,
+    "name": "Ensure checkout cache"
+  },
+  {
+    "cmd": [],
+    "name": "ensure goma"
+  },
+  {
+    "cmd": [
+      "cipd",
+      "ensure",
+      "-root",
+      "[CACHE]/goma/client",
+      "-ensure-file",
+      "fuchsia/third_party/goma/client/${platform} release",
+      "-max-threads",
+      "0",
+      "-json-output",
+      "/path/to/tmp/json"
+    ],
+    "infra_step": true,
+    "name": "ensure goma.ensure_installed",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"result\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"\": [@@@",
+      "@@@STEP_LOG_LINE@json.output@      {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"instance_id\": \"resolved-instance_id-of-release---------\", @@@",
+      "@@@STEP_LOG_LINE@json.output@        \"package\": \"fuchsia/third_party/goma/client/resolved-platform\"@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@STEP_LOG_LINE@json.output@    ]@@@",
+      "@@@STEP_LOG_LINE@json.output@  }@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "Checkout source code"
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "rmtree",
+      "[CACHE]/builder"
+    ],
+    "infra_step": true,
+    "name": "Checkout source code.Clobber cache",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0777",
+      "[CACHE]/builder"
+    ],
+    "infra_step": true,
+    "name": "Checkout source code.Ensure checkout cache",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[depot_tools::bot_update]/resources/bot_update.py",
+      "--spec-path",
+      "cache_dir = '[CACHE]/git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'src/flutter', 'url': 'https://chromium.googlesource.com/external/github.com/flutter/engine'}]",
+      "--revision_mapping_file",
+      "{\"got_engine_revision\": \"src/flutter\"}",
+      "--git-cache-dir",
+      "[CACHE]/git",
+      "--cleanup-dir",
+      "[CLEANUP]/bot_update",
+      "--output_json",
+      "/path/to/tmp/json",
+      "--revision",
+      "src/flutter@HEAD"
+    ],
+    "cwd": "[CACHE]/builder",
+    "env": {
+      "GIT_HTTP_LOW_SPEED_LIMIT": "102400",
+      "GIT_HTTP_LOW_SPEED_TIME": "300"
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "name": "Checkout source code.bot_update",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_TEXT@Some step text@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"did_run\": true, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"fixed_revisions\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"src/flutter\": \"HEAD\"@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"manifest\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"src/flutter\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"repository\": \"https://fake.org/src/flutter.git\", @@@",
+      "@@@STEP_LOG_LINE@json.output@      \"revision\": \"9221bca00ddbd888260084def81f09543281b952\"@@@",
+      "@@@STEP_LOG_LINE@json.output@    }@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"patch_failure\": false, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"patch_root\": \"src/flutter\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"properties\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"got_engine_revision\": \"9221bca00ddbd888260084def81f09543281b952\", @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"got_engine_revision_cp\": \"refs/heads/master@{#84512}\"@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"root\": \"src/flutter\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"source_manifest\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"directories\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"src/flutter\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"git_checkout\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@          \"repo_url\": \"https://fake.org/src/flutter.git\", @@@",
+      "@@@STEP_LOG_LINE@json.output@          \"revision\": \"9221bca00ddbd888260084def81f09543281b952\"@@@",
+      "@@@STEP_LOG_LINE@json.output@        }@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@STEP_LOG_LINE@json.output@    }, @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"version\": 0@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"step_text\": \"Some step text\"@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@",
+      "@@@SET_BUILD_PROPERTY@got_engine_revision@\"9221bca00ddbd888260084def81f09543281b952\"@@@",
+      "@@@SET_BUILD_PROPERTY@got_engine_revision_cp@\"refs/heads/master@{#84512}\"@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_REPO[depot_tools]/gclient.py",
+      "runhooks"
+    ],
+    "cwd": "[CACHE]/builder",
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Checkout source code.gclient runhooks",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0777",
+      "[CACHE]/builder/goldens"
+    ],
+    "infra_step": true,
+    "name": "mkdir goldens"
+  },
+  {
+    "cmd": [],
+    "name": "read yaml",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@yaml@@@@",
+      "@@@STEP_LOG_END@yaml@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "[CACHE]/builder/src/flutter/lib/web_ui/dev/goldens_lock.yaml",
+      "/path/to/tmp/"
+    ],
+    "cwd": "[CACHE]/builder",
+    "infra_step": true,
+    "name": "read yaml.read",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_END@goldens_lock.yaml@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[flutter::yaml]/resources/parse_yaml.py",
+      "--yaml_file",
+      "[CACHE]/builder/src/flutter/lib/web_ui/dev/goldens_lock.yaml",
+      "--json_file",
+      "/path/to/tmp/json"
+    ],
+    "cwd": "[CACHE]/builder",
+    "name": "read yaml.parse",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"repository\": \"repo\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"revision\": \"b6efc758\"@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[depot_tools::git]/resources/git_setup.py",
+      "--path",
+      "[CACHE]/builder/goldens",
+      "--url",
+      "repo"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "name": "git setup"
+  },
+  {
+    "cmd": [
+      "git",
+      "fetch",
+      "origin",
+      "b6efc758",
+      "--recurse-submodules",
+      "--progress"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "env": {
+      "PATH": "RECIPE_REPO[depot_tools]:<PATH>"
+    },
+    "infra_step": true,
+    "name": "git fetch"
+  },
+  {
+    "cmd": [
+      "git",
+      "checkout",
+      "-f",
+      "FETCH_HEAD"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "git checkout"
+  },
+  {
+    "cmd": [
+      "git",
+      "rev-parse",
+      "HEAD"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "read revision",
+    "~followup_annotations": [
+      "@@@STEP_TEXT@<br/>checked out 'deadbeef'<br/>@@@",
+      "@@@SET_BUILD_PROPERTY@got_revision@\"deadbeef\"@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "git",
+      "clean",
+      "-f",
+      "-d",
+      "-x"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "git clean"
+  },
+  {
+    "cmd": [
+      "git",
+      "submodule",
+      "sync"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "submodule sync"
+  },
+  {
+    "cmd": [
+      "git",
+      "submodule",
+      "update",
+      "--init",
+      "--recursive"
+    ],
+    "cwd": "[CACHE]/builder/goldens",
+    "infra_step": true,
+    "name": "submodule update"
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copytree",
+      "[CACHE]/builder/goldens",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/goldens"
+    ],
+    "infra_step": true,
+    "name": "copy goldens"
+  },
+  {
+    "cmd": [
+      "[CACHE]/builder/src/out/host_debug_unopt/dart-sdk/bin/pub",
+      "get"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/web_sdk/web_engine_tester",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "pub get in web_engine_tester"
+  },
+  {
+    "cmd": [
+      "[CACHE]/builder/src/out/host_debug_unopt/dart-sdk/bin/pub",
+      "get"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "pub get in web_ui"
+  },
+  {
+    "cmd": [
+      "cipd",
+      "ensure",
+      "-root",
+      "[CACHE]/osx_sdk",
+      "-ensure-file",
+      "infra/tools/mac_toolchain/${platform} git_revision:9a1adc55bf4a1173784da3ba2f8cb06421606748",
+      "-max-threads",
+      "0",
+      "-json-output",
+      "/path/to/tmp/json"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "name": "ensure_installed",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"result\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"\": [@@@",
+      "@@@STEP_LOG_LINE@json.output@      {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"instance_id\": \"resolved-instance_id-of-git_revision:9a1\", @@@",
+      "@@@STEP_LOG_LINE@json.output@        \"package\": \"infra/tools/mac_toolchain/resolved-platform\"@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@STEP_LOG_LINE@json.output@    ]@@@",
+      "@@@STEP_LOG_LINE@json.output@  }@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "[CACHE]/osx_sdk/mac_toolchain",
+      "install",
+      "-kind",
+      "ios",
+      "-xcode-version",
+      "9f2000",
+      "-output-dir",
+      "[CACHE]/osx_sdk/XCode.app"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "name": "install xcode"
+  },
+  {
+    "cmd": [
+      "sudo",
+      "xcode-select",
+      "--switch",
+      "[CACHE]/osx_sdk/XCode.app"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "name": "select XCode"
+  },
+  {
+    "cmd": [
+      "[CACHE]/builder/src/out/host_debug_unopt/dart-sdk/bin/dart",
+      "dev/felt.dart",
+      "test",
+      "--browser=ios-safari",
+      "--unit-tests-only"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "felt test: ios-safari-unit-tests"
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "copy",
+      "tests for mac",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/test_results/info.txt"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "name": "write info file",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@info.txt@tests for mac@@@",
+      "@@@STEP_LOG_END@info.txt@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[depot_tools::gsutil]/resources/gsutil_smart_retry.py",
+      "--",
+      "RECIPE_REPO[depot_tools]/gsutil.py",
+      "-m",
+      "----",
+      "cp",
+      "-r",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/test_results",
+      "gs://mybucket/web_engine/0/ios-safari"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "name": "gsutil upload goldens 0",
+    "~followup_annotations": [
+      "@@@STEP_LINK@archive goldens@https://console.cloud.google.com/storage/browser/mybucket/web_engine/0/ios-safari@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]/resources/fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "glob",
+      "[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/test_results",
+      "*.html"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "name": "html goldens",
+    "~followup_annotations": [
+      "@@@STEP_LOG_LINE@glob@[CACHE]/builder/src/flutter/lib/web_ui/.dart_tool/test_results/a.html@@@",
+      "@@@STEP_LOG_END@glob@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "Failed golden links",
+    "~followup_annotations": [
+      "@@@STEP_LINK@a.html@https://storage.googleapis.com/mybucket/web_engine/0/ios-safari/a.html@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "Killing Processes"
+  },
+  {
+    "cmd": [
+      "killall",
+      "-9",
+      "dart"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Killing Processes.kill dart",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "killall",
+      "-9",
+      "flutter"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Killing Processes.kill flutter",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "killall",
+      "-9",
+      "Chrome"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Killing Processes.kill Chrome",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "killall",
+      "-9",
+      "Safari"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Killing Processes.kill Safari",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "killall",
+      "-9",
+      "java"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Killing Processes.kill Safari (2)",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "killall",
+      "-9",
+      "adb"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Killing Processes.kill Safari (3)",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "top",
+      "-l",
+      "3",
+      "-o",
+      "mem"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "OS info"
+  },
+  {
+    "cmd": [
+      "sudo",
+      "xcode-select",
+      "--reset"
+    ],
+    "cwd": "[CACHE]/builder/src/flutter/lib/web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]/builder",
+      "GOMA_DIR": "[CACHE]/goma/client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "name": "reset XCode"
+  },
+  {
+    "name": "$result"
+  }
+]
\ No newline at end of file

diff --git a/recipes/engine/web_engine_drone.expected/windows-post-submit.json b/recipes/engine/web_engine_drone.expected/windows-post-submit.json
new file mode 100644
index 0000000..bbf0fe1
--- /dev/null
+++ b/recipes/engine/web_engine_drone.expected/windows-post-submit.json

@@ -0,0 +1,433 @@
+[
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]\\resources\\fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "rmtree",
+      "[CACHE]\\builder\\src\\out"
+    ],
+    "infra_step": true,
+    "name": "Clobber build output: Win"
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]\\resources\\fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0777",
+      "[CACHE]\\builder"
+    ],
+    "infra_step": true,
+    "name": "Ensure checkout cache"
+  },
+  {
+    "cmd": [],
+    "name": "ensure goma"
+  },
+  {
+    "cmd": [
+      "cipd.bat",
+      "ensure",
+      "-root",
+      "[CACHE]\\goma\\client",
+      "-ensure-file",
+      "fuchsia/third_party/goma/client/${platform} release",
+      "-max-threads",
+      "0",
+      "-json-output",
+      "/path/to/tmp/json"
+    ],
+    "infra_step": true,
+    "name": "ensure goma.ensure_installed",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"result\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"\": [@@@",
+      "@@@STEP_LOG_LINE@json.output@      {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"instance_id\": \"resolved-instance_id-of-release---------\", @@@",
+      "@@@STEP_LOG_LINE@json.output@        \"package\": \"fuchsia/third_party/goma/client/resolved-platform\"@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@STEP_LOG_LINE@json.output@    ]@@@",
+      "@@@STEP_LOG_LINE@json.output@  }@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@"
+    ]
+  },
+  {
+    "cmd": [],
+    "name": "Checkout source code"
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]\\resources\\fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "rmtree",
+      "[CACHE]\\builder"
+    ],
+    "infra_step": true,
+    "name": "Checkout source code.Clobber cache",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "vpython",
+      "-u",
+      "RECIPE_MODULE[recipe_engine::file]\\resources\\fileutil.py",
+      "--json-output",
+      "/path/to/tmp/json",
+      "ensure-directory",
+      "--mode",
+      "0777",
+      "[CACHE]\\builder"
+    ],
+    "infra_step": true,
+    "name": "Checkout source code.Ensure checkout cache",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_MODULE[depot_tools::bot_update]\\resources\\bot_update.py",
+      "--spec-path",
+      "cache_dir = '[CACHE]\\\\git'\nsolutions = [{'deps_file': '.DEPS.git', 'managed': True, 'name': 'src/flutter', 'url': 'https://chromium.googlesource.com/external/github.com/flutter/engine'}]",
+      "--revision_mapping_file",
+      "{\"got_engine_revision\": \"src/flutter\"}",
+      "--git-cache-dir",
+      "[CACHE]\\git",
+      "--cleanup-dir",
+      "[CLEANUP]\\bot_update",
+      "--output_json",
+      "/path/to/tmp/json",
+      "--revision",
+      "src/flutter@HEAD"
+    ],
+    "cwd": "[CACHE]\\builder",
+    "env": {
+      "GIT_HTTP_LOW_SPEED_LIMIT": "102400",
+      "GIT_HTTP_LOW_SPEED_TIME": "300"
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "infra_step": true,
+    "name": "Checkout source code.bot_update",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@",
+      "@@@STEP_TEXT@Some step text@@@",
+      "@@@STEP_LOG_LINE@json.output@{@@@",
+      "@@@STEP_LOG_LINE@json.output@  \"did_run\": true, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"fixed_revisions\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"src/flutter\": \"HEAD\"@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"manifest\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"src/flutter\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"repository\": \"https://fake.org/src/flutter.git\", @@@",
+      "@@@STEP_LOG_LINE@json.output@      \"revision\": \"9221bca00ddbd888260084def81f09543281b952\"@@@",
+      "@@@STEP_LOG_LINE@json.output@    }@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"patch_failure\": false, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"patch_root\": \"src/flutter\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"properties\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"got_engine_revision\": \"9221bca00ddbd888260084def81f09543281b952\", @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"got_engine_revision_cp\": \"refs/heads/master@{#84512}\"@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"root\": \"src/flutter\", @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"source_manifest\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@    \"directories\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@      \"src/flutter\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@        \"git_checkout\": {@@@",
+      "@@@STEP_LOG_LINE@json.output@          \"repo_url\": \"https://fake.org/src/flutter.git\", @@@",
+      "@@@STEP_LOG_LINE@json.output@          \"revision\": \"9221bca00ddbd888260084def81f09543281b952\"@@@",
+      "@@@STEP_LOG_LINE@json.output@        }@@@",
+      "@@@STEP_LOG_LINE@json.output@      }@@@",
+      "@@@STEP_LOG_LINE@json.output@    }, @@@",
+      "@@@STEP_LOG_LINE@json.output@    \"version\": 0@@@",
+      "@@@STEP_LOG_LINE@json.output@  }, @@@",
+      "@@@STEP_LOG_LINE@json.output@  \"step_text\": \"Some step text\"@@@",
+      "@@@STEP_LOG_LINE@json.output@}@@@",
+      "@@@STEP_LOG_END@json.output@@@",
+      "@@@SET_BUILD_PROPERTY@got_engine_revision@\"9221bca00ddbd888260084def81f09543281b952\"@@@",
+      "@@@SET_BUILD_PROPERTY@got_engine_revision_cp@\"refs/heads/master@{#84512}\"@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_REPO[depot_tools]\\gclient.py",
+      "runhooks"
+    ],
+    "cwd": "[CACHE]\\builder",
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Checkout source code.gclient runhooks",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "[CACHE]\\builder\\src\\out\\host_debug_unopt\\dart-sdk\\bin\\pub",
+      "get"
+    ],
+    "cwd": "[CACHE]\\builder\\src\\flutter\\web_sdk\\web_engine_tester",
+    "env": {
+      "ANDROID_HOME": "[CACHE]\\builder\\src\\third_party\\android_tools\\sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]\\builder",
+      "GOMA_DIR": "[CACHE]\\goma\\client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]\\builder\\src\\third_party\\dart\\tools\\sdks\\dart-sdk\\bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "pub get in web_engine_tester"
+  },
+  {
+    "cmd": [
+      "[CACHE]\\builder\\src\\out\\host_debug_unopt\\dart-sdk\\bin\\pub",
+      "get"
+    ],
+    "cwd": "[CACHE]\\builder\\src\\flutter\\lib\\web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]\\builder\\src\\third_party\\android_tools\\sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]\\builder",
+      "GOMA_DIR": "[CACHE]\\goma\\client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]\\builder\\src\\third_party\\dart\\tools\\sdks\\dart-sdk\\bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "pub get in web_ui"
+  },
+  {
+    "cmd": [
+      "[CACHE]\\builder\\src\\out\\host_debug_unopt\\dart-sdk\\bin\\dart",
+      "dev/felt.dart",
+      "test"
+    ],
+    "cwd": "[CACHE]\\builder\\src\\flutter\\lib\\web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]\\builder\\src\\third_party\\android_tools\\sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]\\builder",
+      "GOMA_DIR": "[CACHE]\\goma\\client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]\\builder\\src\\third_party\\dart\\tools\\sdks\\dart-sdk\\bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "felt test: test"
+  },
+  {
+    "cmd": [],
+    "name": "Killing Processes"
+  },
+  {
+    "cmd": [
+      "taskkill",
+      "/f",
+      "/im",
+      "java.exe",
+      "/t"
+    ],
+    "cwd": "[CACHE]\\builder\\src\\flutter\\lib\\web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]\\builder\\src\\third_party\\android_tools\\sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]\\builder",
+      "GOMA_DIR": "[CACHE]\\goma\\client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]\\builder\\src\\third_party\\dart\\tools\\sdks\\dart-sdk\\bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Killing Processes.stop gradle daemon",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "taskkill",
+      "/f",
+      "/im",
+      "dart.exe",
+      "/t"
+    ],
+    "cwd": "[CACHE]\\builder\\src\\flutter\\lib\\web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]\\builder\\src\\third_party\\android_tools\\sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]\\builder",
+      "GOMA_DIR": "[CACHE]\\goma\\client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]\\builder\\src\\third_party\\dart\\tools\\sdks\\dart-sdk\\bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Killing Processes.stop dart",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "taskkill",
+      "/f",
+      "/im",
+      "adb.exe",
+      "/t"
+    ],
+    "cwd": "[CACHE]\\builder\\src\\flutter\\lib\\web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]\\builder\\src\\third_party\\android_tools\\sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]\\builder",
+      "GOMA_DIR": "[CACHE]\\goma\\client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]\\builder\\src\\third_party\\dart\\tools\\sdks\\dart-sdk\\bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Killing Processes.stop adb",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "cmd": [
+      "taskkill",
+      "/f",
+      "/im",
+      "flutter_tester.exe",
+      "/t"
+    ],
+    "cwd": "[CACHE]\\builder\\src\\flutter\\lib\\web_ui",
+    "env": {
+      "ANDROID_HOME": "[CACHE]\\builder\\src\\third_party\\android_tools\\sdk",
+      "CHROME_NO_SANDBOX": "true",
+      "ENGINE_PATH": "[CACHE]\\builder",
+      "GOMA_DIR": "[CACHE]\\goma\\client"
+    },
+    "env_prefixes": {
+      "PATH": [
+        "[CACHE]\\builder\\src\\third_party\\dart\\tools\\sdks\\dart-sdk\\bin"
+      ]
+    },
+    "env_suffixes": {
+      "DEPOT_TOOLS_UPDATE": [
+        "0",
+        "0"
+      ],
+      "PATH": [
+        "RECIPE_REPO[depot_tools]",
+        "RECIPE_REPO[depot_tools]"
+      ]
+    },
+    "name": "Killing Processes.stop flutter_tester",
+    "~followup_annotations": [
+      "@@@STEP_NEST_LEVEL@1@@@"
+    ]
+  },
+  {
+    "name": "$result"
+  }
+]
\ No newline at end of file

diff --git a/recipes/engine/web_engine_drone.py b/recipes/engine/web_engine_drone.py
new file mode 100644
index 0000000..a48190c
--- /dev/null
+++ b/recipes/engine/web_engine_drone.py

@@ -0,0 +1,214 @@
+# Copyright 2020 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+"""Recipe for engine shards.
+
+   web_engine.py will call these shards. It will build the Flutter Web Engine,
+   and will archive it to the isolate server.
+
+   These shards will be called with required dependencies, felt commands, and
+   with an isolate hash of the Flutter Web Engine.
+"""
+
+import contextlib
+import copy
+
+from recipe_engine import recipe_api
+
+from PB.recipes.flutter.engine import InputProperties
+from PB.recipes.flutter.engine import EnvProperties
+
+DEPS = [
+    'depot_tools/bot_update',
+    'depot_tools/depot_tools',
+    'depot_tools/osx_sdk',
+    'flutter/flutter_deps',
+    'flutter/os_utils',
+    'flutter/json_util',
+    'flutter/repo_util',
+    'flutter/web_util',
+    'fuchsia/goma',
+    'recipe_engine/context',
+    'recipe_engine/file',
+    'recipe_engine/json',
+    'recipe_engine/path',
+    'recipe_engine/platform',
+    'recipe_engine/properties',
+    'recipe_engine/runtime',
+    'recipe_engine/step',
+]
+
+GIT_REPO = (
+    'https://chromium.googlesource.com/external/github.com/flutter/engine')
+
+PROPERTIES = InputProperties
+ENV_PROPERTIES = EnvProperties
+
+
+def GetCheckoutPath(api):
+  """Path to checkout the flutter/engine repo."""
+  return api.path['cache'].join('builder', 'src')
+
+def RunSteps(api, properties, env_properties):
+  """Steps to checkout flutter engine and execute web test shard.
+
+  The test shard to run will be determined by `command_args` send as part of
+  properties.
+  """
+  cache_root = api.path['cache'].join('builder')
+  checkout = GetCheckoutPath(api)
+  platform = api.platform.name.capitalize()
+  if properties.clobber:
+    api.file.rmtree('Clobber cache', cache_root)
+  api.file.rmtree('Clobber build output: %s' % platform, checkout.join('out'))
+
+  api.file.ensure_directory('Ensure checkout cache', cache_root)
+  api.goma.ensure()
+  env = {}
+  env_prefixes = {}
+
+  # Checkout source code and build
+  api.repo_util.engine_checkout(cache_root, env, env_prefixes)
+
+  # Prepare the dependencies that web tests need.
+  # These can be browsers, web drivers or other repositories.
+  api.web_util.prepare_dependencies(checkout)
+
+  with api.context(
+      cwd=cache_root, env=env,
+      env_prefixes=env_prefixes), api.depot_tools.on_path():
+
+    target_name = 'host_debug_unopt'
+
+    # Load local engine information if available.
+    api.flutter_deps.flutter_engine(env, env_prefixes)
+
+    android_home = checkout.join('third_party', 'android_tools', 'sdk')
+    env = {
+        'GOMA_DIR': api.goma.goma_dir,
+        'ANDROID_HOME': str(android_home),
+        'CHROME_NO_SANDBOX': 'true',
+        'ENGINE_PATH': cache_root,
+    }
+    # flutter_engine deps adds dart dependency as out/host_debug_unopt/dart-sdk
+    # We are changing it with src/third_party/dart/tools/sdks/dart-sdk
+    dart_bin = checkout.join('third_party', 'dart', 'tools', 'sdks', 'dart-sdk',
+                             'bin')
+    paths = env_prefixes.get('PATH', [])
+    paths.insert(0, dart_bin)
+    env_prefixes['PATH'] = paths
+
+    command_args = api.properties.get('command_args', ['test'])
+    command_name = api.properties.get('command_name', 'test')
+    felt_cmd = [
+        checkout.join('out', target_name, 'dart-sdk', 'bin', 'dart'),
+        'dev/felt.dart'
+    ]
+    felt_cmd.extend(command_args)
+
+    with api.context(
+        cwd=cache_root, env=env,
+        env_prefixes=env_prefixes), api.depot_tools.on_path():
+      # Update dart packages and run tests.
+      local_pub = checkout.join('out', target_name, 'dart-sdk', 'bin', 'pub')
+      with api.context(
+          cwd=checkout.join('flutter', 'web_sdk', 'web_engine_tester')):
+        api.step('pub get in web_engine_tester', [local_pub, 'get'])
+      with api.context(cwd=checkout.join('flutter', 'lib', 'web_ui')):
+        api.step('pub get in web_ui', [local_pub, 'get'])
+        if api.platform.is_mac:
+          with api.osx_sdk('ios'):
+            with recipe_api.defer_results():
+              api.step('felt test: %s' % command_name, felt_cmd)
+              if api.properties.get(
+                  'dependencies') and 'goldens_repo' in api.properties.get(
+                      'dependencies'):
+                api.web_util.upload_failing_goldens(checkout, 'ios-safari')
+              # This is to clean up leaked processes.
+              api.os_utils.kill_processes()
+              # Collect memory/cpu/process after task execution.
+              api.os_utils.collect_os_info()
+        else:
+          with recipe_api.defer_results():
+            api.step('felt test: %s' % command_name, felt_cmd)
+            if api.properties.get(
+                'dependencies') and 'goldens_repo' in api.properties.get(
+                    'dependencies'):
+              api.web_util.upload_failing_goldens(checkout, 'chrome')
+            # This is to clean up leaked processes.
+            api.os_utils.kill_processes()
+            # Collect memory/cpu/process after task execution.
+            api.os_utils.collect_os_info()
+
+
+def GenTests(api):
+  golden_yaml_file = {'repository': 'repo', 'revision': 'b6efc758'}
+  browser_yaml_file = {
+      'required_driver_version': {
+          'chrome': 84
+      },
+      'chrome': {
+          'Linux': '768968',
+          'Mac': '768985',
+          'Win': '768975'
+      }
+  }
+  yield api.test(
+      'linux-post-submit',
+      api.step_data('read browser lock yaml.parse',
+                    api.json.output(browser_yaml_file)),
+      api.step_data('read browser lock yaml (2).parse',
+                    api.json.output(browser_yaml_file)),
+      api.step_data('read yaml.parse', api.json.output(golden_yaml_file)),
+      api.properties(
+          goma_jobs='200',
+          gcs_goldens_bucket='mybucket',
+          dependencies=['chrome_driver', 'chrome', 'goldens_repo'],
+          command_args=['test', '--browser=chrome', '--integration-tests-only'],
+          command_name='chrome-integration-tests'), api.platform(
+              'linux', 64)) + api.runtime(
+                  is_experimental=False) + api.platform.name('linux')
+  yield api.test(
+      'linux-firefox-integration',
+      api.step_data('read yaml.parse', api.json.output(golden_yaml_file)),
+      api.properties(
+          goma_jobs='200',
+          gcs_goldens_bucket='mybucket',
+          dependencies=['firefox_driver', 'goldens_repo'],
+          command_args=[
+              'test', '--browser=firefox', '--integration-tests-only'
+          ],
+          command_name='firefox-integration-tests'), api.platform.name('linux'),
+      api.platform('linux', 64)) + api.runtime(is_experimental=False)
+  yield api.test('windows-post-submit') + api.properties(
+      goma_jobs='200') + api.platform('win',
+                                      32) + api.runtime(is_experimental=False)
+  yield api.test(
+      'mac-post-submit',
+      api.step_data('read yaml.parse', api.json.output(golden_yaml_file)),
+      api.properties(
+          goma_jobs='200',
+          gcs_goldens_bucket='mybucket',
+          dependencies=['goldens_repo'],
+          command_args=['test', '--browser=ios-safari', '--unit-tests-only'],
+          command_name='ios-safari-unit-tests'), api.platform(
+              'mac', 64)) + api.runtime(is_experimental=False)
+  yield api.test(
+      'linux-experimental',
+      api.step_data('read yaml.parse', api.json.output(golden_yaml_file)),
+      api.properties(
+          goma_jobs='200',
+          git_url='https://mygitrepo',
+          git_ref='refs/pull/1/head',
+          dependencies=['goldens_repo'],
+          clobber=True), api.platform('linux',
+                                      64)) + api.runtime(is_experimental=True)
+  yield api.test(
+      'linux-error',
+      api.properties(
+          goma_jobs='200',
+          git_url='https://mygitrepo',
+          git_ref='refs/pull/1/head',
+          dependencies=['invalid_dependency'],
+          clobber=True), api.platform('linux', 64),
+      api.expect_exception('ValueError')) + api.runtime(is_experimental=True)

diff --git a/recipes/web_engine.expected/linux-post-submit.json b/recipes/web_engine.expected/linux-post-submit.json
index 785444d..6d89280 100644
--- a/recipes/web_engine.expected/linux-post-submit.json
+++ b/recipes/web_engine.expected/linux-post-submit.json

@@ -284,63 +284,6 @@
   },
   {
     "cmd": [
-      "git",
-      "fetch",
-      "https://dart.googlesource.com/sdk.git",
-      "--tags"
-    ],
-    "cwd": "[CACHE]/builder/src/third_party/dart",
-    "env": {
-      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
-      "CHROME_NO_SANDBOX": "true",
-      "ENGINE_PATH": "[CACHE]/builder",
-      "GOMA_DIR": "[CACHE]/goma/client"
-    },
-    "env_prefixes": {
-      "PATH": [
-        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
-      ]
-    },
-    "env_suffixes": {
-      "DEPOT_TOOLS_UPDATE": [
-        "0"
-      ],
-      "PATH": [
-        "RECIPE_REPO[depot_tools]"
-      ]
-    },
-    "name": "Fetch dart tags"
-  },
-  {
-    "cmd": [
-      "git",
-      "tag",
-      "--list"
-    ],
-    "cwd": "[CACHE]/builder/src/third_party/dart",
-    "env": {
-      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
-      "CHROME_NO_SANDBOX": "true",
-      "ENGINE_PATH": "[CACHE]/builder",
-      "GOMA_DIR": "[CACHE]/goma/client"
-    },
-    "env_prefixes": {
-      "PATH": [
-        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
-      ]
-    },
-    "env_suffixes": {
-      "DEPOT_TOOLS_UPDATE": [
-        "0"
-      ],
-      "PATH": [
-        "RECIPE_REPO[depot_tools]"
-      ]
-    },
-    "name": "List all tags"
-  },
-  {
-    "cmd": [
       "python",
       "-u",
       "RECIPE_REPO[depot_tools]/gclient.py",

diff --git a/recipes/web_engine.expected/linux-pre-submit.json b/recipes/web_engine.expected/linux-pre-submit.json
index 1b66446..1278e2e 100644
--- a/recipes/web_engine.expected/linux-pre-submit.json
+++ b/recipes/web_engine.expected/linux-pre-submit.json

@@ -299,63 +299,6 @@
   },
   {
     "cmd": [
-      "git",
-      "fetch",
-      "https://dart.googlesource.com/sdk.git",
-      "--tags"
-    ],
-    "cwd": "[CACHE]/builder/src/third_party/dart",
-    "env": {
-      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
-      "CHROME_NO_SANDBOX": "true",
-      "ENGINE_PATH": "[CACHE]/builder",
-      "GOMA_DIR": "[CACHE]/goma/client"
-    },
-    "env_prefixes": {
-      "PATH": [
-        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
-      ]
-    },
-    "env_suffixes": {
-      "DEPOT_TOOLS_UPDATE": [
-        "0"
-      ],
-      "PATH": [
-        "RECIPE_REPO[depot_tools]"
-      ]
-    },
-    "name": "Fetch dart tags"
-  },
-  {
-    "cmd": [
-      "git",
-      "tag",
-      "--list"
-    ],
-    "cwd": "[CACHE]/builder/src/third_party/dart",
-    "env": {
-      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
-      "CHROME_NO_SANDBOX": "true",
-      "ENGINE_PATH": "[CACHE]/builder",
-      "GOMA_DIR": "[CACHE]/goma/client"
-    },
-    "env_prefixes": {
-      "PATH": [
-        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
-      ]
-    },
-    "env_suffixes": {
-      "DEPOT_TOOLS_UPDATE": [
-        "0"
-      ],
-      "PATH": [
-        "RECIPE_REPO[depot_tools]"
-      ]
-    },
-    "name": "List all tags"
-  },
-  {
-    "cmd": [
       "python",
       "-u",
       "RECIPE_REPO[depot_tools]/gclient.py",

diff --git a/recipes/web_engine.expected/mac-post-submit.json b/recipes/web_engine.expected/mac-post-submit.json
index 4149813..21ee450 100644
--- a/recipes/web_engine.expected/mac-post-submit.json
+++ b/recipes/web_engine.expected/mac-post-submit.json

@@ -392,63 +392,6 @@
   },
   {
     "cmd": [
-      "git",
-      "fetch",
-      "https://dart.googlesource.com/sdk.git",
-      "--tags"
-    ],
-    "cwd": "[CACHE]/builder/src/third_party/dart",
-    "env": {
-      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
-      "CHROME_NO_SANDBOX": "true",
-      "ENGINE_PATH": "[CACHE]/builder",
-      "GOMA_DIR": "[CACHE]/goma/client"
-    },
-    "env_prefixes": {
-      "PATH": [
-        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
-      ]
-    },
-    "env_suffixes": {
-      "DEPOT_TOOLS_UPDATE": [
-        "0"
-      ],
-      "PATH": [
-        "RECIPE_REPO[depot_tools]"
-      ]
-    },
-    "name": "Fetch dart tags"
-  },
-  {
-    "cmd": [
-      "git",
-      "tag",
-      "--list"
-    ],
-    "cwd": "[CACHE]/builder/src/third_party/dart",
-    "env": {
-      "ANDROID_HOME": "[CACHE]/builder/src/third_party/android_tools/sdk",
-      "CHROME_NO_SANDBOX": "true",
-      "ENGINE_PATH": "[CACHE]/builder",
-      "GOMA_DIR": "[CACHE]/goma/client"
-    },
-    "env_prefixes": {
-      "PATH": [
-        "[CACHE]/builder/src/third_party/dart/tools/sdks/dart-sdk/bin"
-      ]
-    },
-    "env_suffixes": {
-      "DEPOT_TOOLS_UPDATE": [
-        "0"
-      ],
-      "PATH": [
-        "RECIPE_REPO[depot_tools]"
-      ]
-    },
-    "name": "List all tags"
-  },
-  {
-    "cmd": [
       "python",
       "-u",
       "RECIPE_REPO[depot_tools]/gclient.py",

diff --git a/recipes/web_engine.expected/windows-post-submit.json b/recipes/web_engine.expected/windows-post-submit.json
index b39d79b..7b15b08 100644
--- a/recipes/web_engine.expected/windows-post-submit.json
+++ b/recipes/web_engine.expected/windows-post-submit.json

@@ -217,63 +217,6 @@
   },
   {
     "cmd": [
-      "git",
-      "fetch",
-      "https://dart.googlesource.com/sdk.git",
-      "--tags"
-    ],
-    "cwd": "[CACHE]\\builder\\src\\third_party\\dart",
-    "env": {
-      "ANDROID_HOME": "[CACHE]\\builder\\src\\third_party\\android_tools\\sdk",
-      "CHROME_NO_SANDBOX": "true",
-      "ENGINE_PATH": "[CACHE]\\builder",
-      "GOMA_DIR": "[CACHE]\\goma\\client"
-    },
-    "env_prefixes": {
-      "PATH": [
-        "[CACHE]\\builder\\src\\third_party\\dart\\tools\\sdks\\dart-sdk\\bin"
-      ]
-    },
-    "env_suffixes": {
-      "DEPOT_TOOLS_UPDATE": [
-        "0"
-      ],
-      "PATH": [
-        "RECIPE_REPO[depot_tools]"
-      ]
-    },
-    "name": "Fetch dart tags"
-  },
-  {
-    "cmd": [
-      "git",
-      "tag",
-      "--list"
-    ],
-    "cwd": "[CACHE]\\builder\\src\\third_party\\dart",
-    "env": {
-      "ANDROID_HOME": "[CACHE]\\builder\\src\\third_party\\android_tools\\sdk",
-      "CHROME_NO_SANDBOX": "true",
-      "ENGINE_PATH": "[CACHE]\\builder",
-      "GOMA_DIR": "[CACHE]\\goma\\client"
-    },
-    "env_prefixes": {
-      "PATH": [
-        "[CACHE]\\builder\\src\\third_party\\dart\\tools\\sdks\\dart-sdk\\bin"
-      ]
-    },
-    "env_suffixes": {
-      "DEPOT_TOOLS_UPDATE": [
-        "0"
-      ],
-      "PATH": [
-        "RECIPE_REPO[depot_tools]"
-      ]
-    },
-    "name": "List all tags"
-  },
-  {
-    "cmd": [
       "python",
       "-u",
       "RECIPE_REPO[depot_tools]\\gclient.py",

diff --git a/recipes/web_engine.py b/recipes/web_engine.py
index 303f6bc..4310038 100644
--- a/recipes/web_engine.py
+++ b/recipes/web_engine.py

@@ -234,16 +234,6 @@
       FormatAndDartTest(api)
       Lint(api)
 
-    # Presence of tags in git repo is critical for determining dart version.
-    dart_sdk_dir = GetCheckoutPath(api).join('third_party', 'dart')
-    with api.context(cwd=dart_sdk_dir):
-      # The default fetch remote is a local dir, so explicitly fetch from
-      # upstream remote
-      api.step(
-          'Fetch dart tags',
-          ['git', 'fetch', 'https://dart.googlesource.com/sdk.git', '--tags'])
-      api.step('List all tags', ['git', 'tag', '--list'])
-
     api.gclient.runhooks()
 
     target_name = 'host_debug_unopt'
commit	69b3bdb82b5ee2b0adc02c5a9e56abd225c46721	[log] [tgz]
author	Nurhan Turgut <nurhan@google.com>	Wed Nov 25 19:59:54 2020 +0000
committer	CQ Bot Account <flutter-scoped@luci-project-accounts.iam.gserviceaccount.com>	Wed Nov 25 19:59:54 2020 +0000
tree	73e6778f66a6d9a5c0b09842fe29ef2922f13839
parent	cad945da45f54562134a9ddc70f47edaa8312d85 [diff]