[SyncFS] Add bulk update method to MetadataDatabase

chrome/browser/sync_file_system/drive_backend/metadata_database.h

Index: chrome/browser/sync_file_system/drive_backend/metadata_database.h
diff --git a/chrome/browser/sync_file_system/drive_backend/metadata_database.h b/chrome/browser/sync_file_system/drive_backend/metadata_database.h
index 1bef1408dcf3d72f4d972305429d816bd4f7973a..a0601d7c9c8a851cd1c924768bd978b73981a279 100644
--- a/chrome/browser/sync_file_system/drive_backend/metadata_database.h
+++ b/chrome/browser/sync_file_system/drive_backend/metadata_database.h
@@ -247,6 +247,9 @@ class MetadataDatabase {
   // needed.
   void UpdateByFileResource(const google_apis::FileResource& resource,
                             const SyncStatusCallback& callback);
+  void UpdateByFileResourceList(
+      ScopedVector<google_apis::FileResource> resources,
+      const SyncStatusCallback& callback);
 
   void UpdateByDeletedRemoteFile(const std::string& file_id,
                                  const SyncStatusCallback& callback);