tools/android/loading Switch the GCE worker to pull queues

tools/android/loading/cloud/backend/google_storage_accessor.py

Index: tools/android/loading/cloud/backend/google_storage_accessor.py
diff --git a/tools/android/loading/gce/google_storage_accessor.py b/tools/android/loading/cloud/backend/google_storage_accessor.py
similarity index 91%
rename from tools/android/loading/gce/google_storage_accessor.py
rename to tools/android/loading/cloud/backend/google_storage_accessor.py
index 59c47da3ec04976fa2d1ee6dc428ce11727144df..86e238e8e2f0560c1ee28804a3ebb5423d6649f6 100644
--- a/tools/android/loading/gce/google_storage_accessor.py
+++ b/tools/android/loading/cloud/backend/google_storage_accessor.py
@@ -3,17 +3,16 @@
 # found in the LICENSE file.
 
 from gcloud import storage
-from oauth2client.client import GoogleCredentials
 
 
 class GoogleStorageAccessor(object):
   """Utility class providing helpers for Google Cloud Storage.
   """
-  def __init__(self, project_name, bucket_name):
+  def __init__(self, credentials, project_name, bucket_name):
     """project_name is the name of the Google Cloud project.
     bucket_name is the name of the bucket that is used for Cloud Storage calls.
     """
-    self._credentials = GoogleCredentials.get_application_default()
+    self._credentials = credentials
     self._project_name = project_name
     self._bucket_name = bucket_name