Do not generate provenance if on Windows machine.

The provenance generation on Windows machines for BCID compliance is not yet ready, but instead of creating a failure in that scenario, this change allows for the provenance generation to be skipped. After Windows provenance generation is available, we will uncomment this line.

Change-Id: I203e267b0aed542e686f58eacdb4c150152e5d7c
Reviewed-on: https://flutter-review.googlesource.com/c/recipes/+/37101
Commit-Queue: Jesse Seales <jseales@google.com>
Reviewed-by: Godofredo Contreras <godofredoc@google.com>

recipe_modules/flutter_bcid/__init__.py

diff --git a/recipe_modules/flutter_bcid/__init__.py b/recipe_modules/flutter_bcid/__init__.py
index d148649..c790b26 100644
--- a/recipe_modules/flutter_bcid/__init__.py
+++ b/recipe_modules/flutter_bcid/__init__.py
@@ -7,4 +7,5 @@
     'recipe_engine/bcid_reporter',
     'recipe_engine/buildbucket',
     'recipe_engine/file',
+    'recipe_engine/platform',
 ]

recipe_modules/flutter_bcid/api.py

diff --git a/recipe_modules/flutter_bcid/api.py b/recipe_modules/flutter_bcid/api.py
index 8b84261..89018e9 100644
--- a/recipe_modules/flutter_bcid/api.py
+++ b/recipe_modules/flutter_bcid/api.py
@@ -40,7 +40,11 @@
       local_artifact_path: (str) path and filename of a specific file.
       remote_artifact_path: (str) path and filename of a specific file.
     """
-    if self._is_official_build():
+    if (self._is_official_build() and 
+      # TODO(jseales): Uncomment next line after windows
+      # can generate provenance succesfully
+      # https://github.com/flutter/flutter/issues/116749
+      not self.m.platform.is_win):
       sha256 = self.m.file.file_hash(local_artifact_path)
       self.m.bcid_reporter.report_gcs(
           sha256,