Sync FileSystem: Add default mock expectation for MockDriveService::GetChangeList

chrome/browser/google_apis/mock_drive_service.h

Index: chrome/browser/google_apis/mock_drive_service.h
diff --git a/chrome/browser/google_apis/mock_drive_service.h b/chrome/browser/google_apis/mock_drive_service.h
index 8d3bf0fafd2e27f70c8d3398407a413033e81a51..9febf3d7fcbf0afc7e34dfc56552613ce76de9e4 100644
--- a/chrome/browser/google_apis/mock_drive_service.h
+++ b/chrome/browser/google_apis/mock_drive_service.h
@@ -143,6 +143,10 @@ class MockDriveService : public DriveServiceInterface {
   // Helper stub methods for functions which take callbacks, so that
   // the callbacks get called with testable results.
 
+  // Will call |callback| with HTTP_SUCCESS and a empty ResourceList.
+  void GetChangeListStub(int64 start_changestamp,
+                         const GetResourceListCallback& callback);
+
   // Will call |callback| with HTTP_SUCCESS and a StringValue with the current
   // value of |account_metadata_|.
   void GetAccountMetadataStub(const GetAccountMetadataCallback& callback);