Look in partner bucket while uploading .sha1 files.

tools/perf/page_sets/PRESUBMIT.py

 # Copyright 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import os
 import re
 import sys
 
 
 def LoadSupport(input_api):
@@ skipping 21 matching lines @@
   for affected_file in input_api.AffectedFiles(include_deletes=False):
     hash_path = affected_file.AbsoluteLocalPath()
     _, extension = os.path.splitext(hash_path)
     if extension == '.sha1':
       hash_paths.append(hash_path)
   if not hash_paths:
     return []
 
   cloud_storage = LoadSupport(input_api)
 
-  # Look in both buckets, in case the user uploaded the file manually. But this
+  # Look in all buckets, in case the user uploaded the file manually. But this
   # script focuses on WPR archives, so it only uploads to the internal bucket.
   hashes_in_cloud_storage = cloud_storage.List(cloud_storage.PUBLIC_BUCKET)
   try:
+    hashes_in_cloud_storage += cloud_storage.List(cloud_storage.PARTNER_BUCKET)
     hashes_in_cloud_storage += cloud_storage.List(cloud_storage.INTERNAL_BUCKET)
   except (cloud_storage.PermissionError, cloud_storage.CredentialsError):
     pass
 
   files = []
   for hash_path in hash_paths:
     file_hash = cloud_storage.ReadHash(hash_path)
     if file_hash not in hashes_in_cloud_storage:
       files.append((hash_path, file_hash))
 
@@ skipping 70 matching lines @@
   return input_api.AffectedFiles(file_filter=_IsNewJsonPageSet)
 
 def CheckChangeOnUpload(input_api, output_api):
   results = _SyncFilesToCloud(input_api, output_api)
   return results
 
 
 def CheckChangeOnCommit(input_api, output_api):
   results = _VerifyFilesInCloud(input_api, output_api)
   return results