Prevent mac resource deadlock situations.

We are giving subbuilds higher priority to ensure all the tasks can
get the required resources to complete the build.

Change-Id: I17898d6706cfc2dc18a125bc35e337ddaed86bf6
Bug: https://github.com/flutter/flutter/issues/59169
Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/3522
Reviewed-by: Tong Wu <wutong@google.com>
Commit-Queue: Godofredo Contreras <godofredoc@google.com>
diff --git a/recipes/engine.expected/Linux Fuchsia failing test.json b/recipes/engine.expected/Linux Fuchsia failing test.json
index 9c84b58..b552e5b 100644
--- a/recipes/engine.expected/Linux Fuchsia failing test.json
+++ b/recipes/engine.expected/Linux Fuchsia failing test.json
@@ -16841,7 +16841,7 @@
     },
     "infra_step": true,
     "name": "buildbucket.schedule",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-arm64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-arm64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -16875,7 +16875,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"external/github.com/flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -16954,7 +16954,7 @@
     },
     "infra_step": true,
     "name": "buildbucket.schedule (2)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-arm64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133a\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-arm64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133a\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -16988,7 +16988,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"external/github.com/flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -17067,7 +17067,7 @@
     },
     "infra_step": true,
     "name": "buildbucket.schedule (3)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-x64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133d\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-x64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133d\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -17101,7 +17101,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"external/github.com/flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -17180,7 +17180,7 @@
     },
     "infra_step": true,
     "name": "buildbucket.schedule (4)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-x64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001340\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-x64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001340\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -17214,7 +17214,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"external/github.com/flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
diff --git a/recipes/engine.expected/clobber.json b/recipes/engine.expected/clobber.json
index 2f60ecd..13f9f60 100644
--- a/recipes/engine.expected/clobber.json
+++ b/recipes/engine.expected/clobber.json
@@ -14102,7 +14102,7 @@
     },
     "infra_step": true,
     "name": "buildbucket.schedule",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"github.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-arm64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}], \"git_ref\": \"refs/pull/1/head\", \"git_url\": \"https://github.com/flutter/engine\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"github.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-arm64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}], \"git_ref\": \"refs/pull/1/head\", \"git_url\": \"https://github.com/flutter/engine\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -14136,7 +14136,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -14217,7 +14217,7 @@
     },
     "infra_step": true,
     "name": "buildbucket.schedule (2)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"github.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-arm64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}], \"git_ref\": \"refs/pull/1/head\", \"git_url\": \"https://github.com/flutter/engine\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133a\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"github.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-arm64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}], \"git_ref\": \"refs/pull/1/head\", \"git_url\": \"https://github.com/flutter/engine\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133a\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -14251,7 +14251,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -14332,7 +14332,7 @@
     },
     "infra_step": true,
     "name": "buildbucket.schedule (3)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"github.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-x64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}], \"git_ref\": \"refs/pull/1/head\", \"git_url\": \"https://github.com/flutter/engine\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133d\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"github.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-x64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}], \"git_ref\": \"refs/pull/1/head\", \"git_url\": \"https://github.com/flutter/engine\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133d\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -14366,7 +14366,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -14447,7 +14447,7 @@
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     "name": "buildbucket.schedule (4)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"github.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-x64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}], \"git_ref\": \"refs/pull/1/head\", \"git_url\": \"https://github.com/flutter/engine\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001340\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"github.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-x64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}], \"git_ref\": \"refs/pull/1/head\", \"git_url\": \"https://github.com/flutter/engine\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001340\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -14481,7 +14481,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
diff --git a/recipes/engine.expected/experimental.json b/recipes/engine.expected/experimental.json
index ccf55d1..3912fd5 100644
--- a/recipes/engine.expected/experimental.json
+++ b/recipes/engine.expected/experimental.json
@@ -14087,7 +14087,7 @@
     },
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     "name": "buildbucket.schedule",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-arm64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-arm64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -14121,7 +14121,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"external/github.com/flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -14200,7 +14200,7 @@
     },
     "infra_step": true,
     "name": "buildbucket.schedule (2)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-arm64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133a\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-arm64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133a\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -14234,7 +14234,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"external/github.com/flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -14313,7 +14313,7 @@
     },
     "infra_step": true,
     "name": "buildbucket.schedule (3)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-x64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133d\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-x64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133d\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -14347,7 +14347,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"external/github.com/flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -14426,7 +14426,7 @@
     },
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     "name": "buildbucket.schedule (4)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-x64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001340\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-x64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001340\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -14460,7 +14460,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"external/github.com/flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
diff --git a/recipes/engine.expected/experimental_upload.json b/recipes/engine.expected/experimental_upload.json
index e972e61..f6b9143 100644
--- a/recipes/engine.expected/experimental_upload.json
+++ b/recipes/engine.expected/experimental_upload.json
@@ -16867,7 +16867,7 @@
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+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-arm64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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@@ -16901,7 +16901,7 @@
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       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
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       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -16980,7 +16980,7 @@
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     "name": "buildbucket.schedule (2)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-arm64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133a\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-arm64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133a\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
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@@ -17014,7 +17014,7 @@
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@@ -17093,7 +17093,7 @@
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     "name": "buildbucket.schedule (3)",
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+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-x64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133d\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
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@@ -17127,7 +17127,7 @@
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@@ -17206,7 +17206,7 @@
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     "name": "buildbucket.schedule (4)",
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@@ -17240,7 +17240,7 @@
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-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
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diff --git a/recipes/engine.expected/first_bot_update_failed.json b/recipes/engine.expected/first_bot_update_failed.json
index 89688c0..8567d92 100644
--- a/recipes/engine.expected/first_bot_update_failed.json
+++ b/recipes/engine.expected/first_bot_update_failed.json
@@ -14238,7 +14238,7 @@
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+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"github.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-arm64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}], \"git_ref\": \"refs/pull/1/head\", \"git_url\": \"https://github.com/flutter/engine\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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@@ -14272,7 +14272,7 @@
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       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
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       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -14353,7 +14353,7 @@
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     "name": "buildbucket.schedule (2)",
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@@ -14387,7 +14387,7 @@
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@@ -14468,7 +14468,7 @@
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     "name": "buildbucket.schedule (3)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"github.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-x64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}], \"git_ref\": \"refs/pull/1/head\", \"git_url\": \"https://github.com/flutter/engine\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133d\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"github.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-x64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}], \"git_ref\": \"refs/pull/1/head\", \"git_url\": \"https://github.com/flutter/engine\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133d\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -14502,7 +14502,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -14583,7 +14583,7 @@
     },
     "infra_step": true,
     "name": "buildbucket.schedule (4)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"github.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-x64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}], \"git_ref\": \"refs/pull/1/head\", \"git_url\": \"https://github.com/flutter/engine\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001340\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"github.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-x64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}], \"git_ref\": \"refs/pull/1/head\", \"git_url\": \"https://github.com/flutter/engine\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001340\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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@@ -14617,7 +14617,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
diff --git a/recipes/engine.expected/linux.json b/recipes/engine.expected/linux.json
index d8b26b9..fb96394 100644
--- a/recipes/engine.expected/linux.json
+++ b/recipes/engine.expected/linux.json
@@ -14061,7 +14061,7 @@
     },
     "infra_step": true,
     "name": "buildbucket.schedule",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-arm64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-arm64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -14095,7 +14095,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"external/github.com/flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -14174,7 +14174,7 @@
     },
     "infra_step": true,
     "name": "buildbucket.schedule (2)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-arm64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133a\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-arm64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133a\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -14208,7 +14208,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"external/github.com/flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -14287,7 +14287,7 @@
     },
     "infra_step": true,
     "name": "buildbucket.schedule (3)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-x64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133d\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-x64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133d\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -14321,7 +14321,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"external/github.com/flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -14400,7 +14400,7 @@
     },
     "infra_step": true,
     "name": "buildbucket.schedule (4)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-x64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001340\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-x64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001340\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -14434,7 +14434,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"external/github.com/flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
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       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
diff --git a/recipes/engine.expected/linux_maven_or_bitcode.json b/recipes/engine.expected/linux_maven_or_bitcode.json
index d8b26b9..fb96394 100644
--- a/recipes/engine.expected/linux_maven_or_bitcode.json
+++ b/recipes/engine.expected/linux_maven_or_bitcode.json
@@ -14061,7 +14061,7 @@
     },
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@@ -14095,7 +14095,7 @@
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@@ -14174,7 +14174,7 @@
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@@ -14208,7 +14208,7 @@
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@@ -14287,7 +14287,7 @@
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@@ -14321,7 +14321,7 @@
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@@ -14400,7 +14400,7 @@
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@@ -14434,7 +14434,7 @@
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-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
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diff --git a/recipes/engine.expected/linux_upload.json b/recipes/engine.expected/linux_upload.json
index 6d4179b..15b06a8 100644
--- a/recipes/engine.expected/linux_upload.json
+++ b/recipes/engine.expected/linux_upload.json
@@ -16841,7 +16841,7 @@
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     "~followup_annotations": [
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@@ -16875,7 +16875,7 @@
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@@ -16954,7 +16954,7 @@
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@@ -16988,7 +16988,7 @@
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@@ -17067,7 +17067,7 @@
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+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-x64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133d\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -17101,7 +17101,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"external/github.com/flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -17180,7 +17180,7 @@
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     "name": "buildbucket.schedule (4)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-x64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001340\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-x64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001340\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -17214,7 +17214,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"external/github.com/flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
diff --git a/recipes/engine.expected/linux_upload_maven_or_bitcode.json b/recipes/engine.expected/linux_upload_maven_or_bitcode.json
index 5164bc0..e0104a0 100644
--- a/recipes/engine.expected/linux_upload_maven_or_bitcode.json
+++ b/recipes/engine.expected/linux_upload_maven_or_bitcode.json
@@ -15797,7 +15797,7 @@
     },
     "infra_step": true,
     "name": "buildbucket.schedule",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-arm64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-arm64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -15831,7 +15831,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"external/github.com/flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -15910,7 +15910,7 @@
     },
     "infra_step": true,
     "name": "buildbucket.schedule (2)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-arm64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133a\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-arm64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133a\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -15944,7 +15944,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"external/github.com/flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -16023,7 +16023,7 @@
     },
     "infra_step": true,
     "name": "buildbucket.schedule (3)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-x64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133d\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-x64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133d\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -16057,7 +16057,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"external/github.com/flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -16136,7 +16136,7 @@
     },
     "infra_step": true,
     "name": "buildbucket.schedule (4)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-x64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001340\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-x64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001340\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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@@ -16170,7 +16170,7 @@
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       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
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diff --git a/recipes/engine.expected/mac.json b/recipes/engine.expected/mac.json
index 4ca661a..4a93dd2 100644
--- a/recipes/engine.expected/mac.json
+++ b/recipes/engine.expected/mac.json
@@ -8768,7 +8768,7 @@
     },
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@@ -8802,7 +8802,7 @@
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-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
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@@ -8881,7 +8881,7 @@
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     "name": "buildbucket.schedule (2)",
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@@ -8915,7 +8915,7 @@
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@@ -8994,7 +8994,7 @@
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@@ -9028,7 +9028,7 @@
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@@ -9107,7 +9107,7 @@
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@@ -9141,7 +9141,7 @@
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diff --git a/recipes/engine.expected/mac_maven_or_bitcode.json b/recipes/engine.expected/mac_maven_or_bitcode.json
index a7646ff..8c0664f 100644
--- a/recipes/engine.expected/mac_maven_or_bitcode.json
+++ b/recipes/engine.expected/mac_maven_or_bitcode.json
@@ -10787,7 +10787,7 @@
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+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-arm64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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@@ -10821,7 +10821,7 @@
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@@ -10900,7 +10900,7 @@
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     "~followup_annotations": [
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@@ -10934,7 +10934,7 @@
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@@ -11013,7 +11013,7 @@
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+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-x64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133d\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -11047,7 +11047,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"external/github.com/flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -11126,7 +11126,7 @@
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     "name": "buildbucket.schedule (4)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-x64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001340\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-x64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001340\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -11160,7 +11160,7 @@
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       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
diff --git a/recipes/engine.expected/mac_upload.json b/recipes/engine.expected/mac_upload.json
index 7160127..90cf759 100644
--- a/recipes/engine.expected/mac_upload.json
+++ b/recipes/engine.expected/mac_upload.json
@@ -9646,7 +9646,7 @@
     },
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     "name": "buildbucket.schedule",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-arm64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-arm64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -9680,7 +9680,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"external/github.com/flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -9759,7 +9759,7 @@
     },
     "infra_step": true,
     "name": "buildbucket.schedule (2)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-arm64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133a\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-arm64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133a\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -9793,7 +9793,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"external/github.com/flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
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       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -9872,7 +9872,7 @@
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     "name": "buildbucket.schedule (3)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-x64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133d\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-x64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133d\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -9906,7 +9906,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"external/github.com/flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
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       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -9985,7 +9985,7 @@
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     "name": "buildbucket.schedule (4)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-x64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001340\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
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     "~followup_annotations": [
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@@ -10019,7 +10019,7 @@
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       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
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diff --git a/recipes/engine.expected/mac_upload_maven_or_bitcode.json b/recipes/engine.expected/mac_upload_maven_or_bitcode.json
index 1c3f7fe..86bcfee 100644
--- a/recipes/engine.expected/mac_upload_maven_or_bitcode.json
+++ b/recipes/engine.expected/mac_upload_maven_or_bitcode.json
@@ -11589,7 +11589,7 @@
     },
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-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-arm64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-arm64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -11623,7 +11623,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"external/github.com/flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -11702,7 +11702,7 @@
     },
     "infra_step": true,
     "name": "buildbucket.schedule (2)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-arm64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133a\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-arm64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133a\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -11736,7 +11736,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"external/github.com/flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -11815,7 +11815,7 @@
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     "name": "buildbucket.schedule (3)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-x64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133d\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-x64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133d\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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@@ -11849,7 +11849,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"external/github.com/flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
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       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -11928,7 +11928,7 @@
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     "name": "buildbucket.schedule (4)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-x64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001340\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"chromium.googlesource.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"external/github.com/flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-x64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}]}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001340\", \"swarming\": {\"parentRunId\": \"deadbeef\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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@@ -11962,7 +11962,7 @@
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       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
diff --git a/recipes/engine.expected/pull_request.json b/recipes/engine.expected/pull_request.json
index 0dc08a4..c279a43 100644
--- a/recipes/engine.expected/pull_request.json
+++ b/recipes/engine.expected/pull_request.json
@@ -14089,7 +14089,7 @@
     },
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     "name": "buildbucket.schedule",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"github.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-arm64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}], \"git_ref\": \"refs/pull/1/head\", \"git_url\": \"https://github.com/flutter/engine\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"github.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-arm64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}], \"git_ref\": \"refs/pull/1/head\", \"git_url\": \"https://github.com/flutter/engine\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001337\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -14123,7 +14123,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -14204,7 +14204,7 @@
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     "infra_step": true,
     "name": "buildbucket.schedule (2)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"github.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-arm64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}], \"git_ref\": \"refs/pull/1/head\", \"git_url\": \"https://github.com/flutter/engine\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133a\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"github.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_arm64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"arm64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-arm64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}], \"git_ref\": \"refs/pull/1/head\", \"git_url\": \"https://github.com/flutter/engine\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133a\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
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@@ -14238,7 +14238,7 @@
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       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
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@@ -14319,7 +14319,7 @@
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     "name": "buildbucket.schedule (3)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"github.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-x64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}], \"git_ref\": \"refs/pull/1/head\", \"git_url\": \"https://github.com/flutter/engine\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133d\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"github.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_profile_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"profile\"], \"output_dirs\": [\"dart_jit_runner_far\", \"dart_aot_runner_far\", \"flutter_jit_runner_far\", \"flutter_aot_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-profile-fuchsia-x64\"], \"output_files\": [\"dart_jit_runner\", \"dart_aot_runner\", \"flutter_jit_runner\", \"flutter_aot_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}], \"git_ref\": \"refs/pull/1/head\", \"git_url\": \"https://github.com/flutter/engine\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-00000000133d\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -14353,7 +14353,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
@@ -14434,7 +14434,7 @@
     },
     "infra_step": true,
     "name": "buildbucket.schedule (4)",
-    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"github.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 30, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-x64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}], \"git_ref\": \"refs/pull/1/head\", \"git_url\": \"https://github.com/flutter/engine\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001340\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
+    "stdin": "{\"requests\": [{\"scheduleBuild\": {\"builder\": {\"bucket\": \"ci\", \"builder\": \"Linux Engine Drone\", \"project\": \"flutter\"}, \"experimental\": \"NO\", \"fields\": \"builder,createTime,createdBy,critical,endTime,id,input,number,output,startTime,status,updateTime\", \"gitilesCommit\": {\"host\": \"github.com\", \"id\": \"2d72510e447ab60a9728aeea2362d8be2cbd7789\", \"project\": \"flutter/engine\", \"ref\": \"refs/heads/master\"}, \"priority\": 25, \"properties\": {\"builds\": [{\"dir\": \"fuchsia_release_x64\", \"gn_args\": [\"--fuchsia\", \"--fuchsia-cpu\", \"x64\", \"--runtime-mode\", \"release\"], \"output_dirs\": [\"dart_jit_product_runner_far\", \"dart_aot_product_runner_far\", \"flutter_jit_product_runner_far\", \"flutter_aot_product_runner_far\", \"dart_runner_patched_sdk\", \"flutter_runner_patched_sdk\", \"clang_x64\", \"flutter-debug-symbols-release-fuchsia-x64\"], \"output_files\": [\"dart_jit_product_runner\", \"dart_aot_product_runner\", \"flutter_jit_product_runner\", \"flutter_aot_product_runner\"], \"targets\": [\"flutter/shell/platform/fuchsia:fuchsia\"]}], \"git_ref\": \"refs/pull/1/head\", \"git_url\": \"https://github.com/flutter/engine\"}, \"requestId\": \"8945511751514863184-00000000-0000-0000-0000-000000001340\", \"swarming\": {\"parentRunId\": \"fake-task-id\"}, \"tags\": [{\"key\": \"user_agent\", \"value\": \"recipe\"}]}}]}",
     "~followup_annotations": [
       "@@@STEP_LOG_LINE@json.output@{@@@",
       "@@@STEP_LOG_LINE@json.output@  \"responses\": [@@@",
@@ -14468,7 +14468,7 @@
       "@@@STEP_LOG_LINE@request@          \"project\": \"flutter/engine\", @@@",
       "@@@STEP_LOG_LINE@request@          \"ref\": \"refs/heads/master\"@@@",
       "@@@STEP_LOG_LINE@request@        }, @@@",
-      "@@@STEP_LOG_LINE@request@        \"priority\": 30, @@@",
+      "@@@STEP_LOG_LINE@request@        \"priority\": 25, @@@",
       "@@@STEP_LOG_LINE@request@        \"properties\": {@@@",
       "@@@STEP_LOG_LINE@request@          \"builds\": [@@@",
       "@@@STEP_LOG_LINE@request@            {@@@",
diff --git a/recipes/engine.py b/recipes/engine.py
index 2564325..f08c5d9 100644
--- a/recipes/engine.py
+++ b/recipes/engine.py
@@ -110,7 +110,16 @@
   req = api.buildbucket.schedule_request(
       swarming_parent_run_id=api.swarming.task_id,
       builder=builder_name,
-      properties=drone_props)
+      properties=drone_props,
+      # Having main build and subbuilds with the same priority can lead
+      # to a deadlock situation when there are limited resources. For example
+      # if we have only 7 mac bots and we get more than 7 new build requests the
+      # within minutes of each other then the 7 bots will be used by main tasks
+      # and they will all timeout waiting for resources to run subbuilds.
+      # Increasing priority won't fix the problem but will make the deadlock
+      # situation less unlikely.
+      # https://github.com/flutter/flutter/issues/59169.
+      priority=25)
   return api.buildbucket.schedule([req])