[SyncFS] Add bulk update method to MetadataDatabase

chrome/browser/sync_file_system/drive_backend/metadata_database.h

 // 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.
 
 #ifndef CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_METADATA_DATABASE_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_METADATA_DATABASE_H_
 
 #include <map>
 #include <set>
 #include <string>
@@ skipping 229 matching lines @@
   // needed.
   void UpdateByChangeList(int64 largest_change_id,
                           ScopedVector<google_apis::ChangeResource> changes,
                           const SyncStatusCallback& callback);
 
   // Updates database by |resource|.
   // Marks each tracker for modified file as dirty and adds new trackers if
   // 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);
 
   // TODO(tzik): Drop |change_id| parameter.
   // Adds new FileTracker and FileMetadata.  The database must not have
   // |resource| beforehand.
   // The newly added tracker under |parent_tracker_id| is active and non-dirty.
   // Deactivates existing active tracker if exists that has the same title and
   // parent_tracker to the newly added tracker.
@@ skipping 175 matching lines @@
 
   base::WeakPtrFactory<MetadataDatabase> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(MetadataDatabase);
 };
 
 }  // namespace drive_backend
 }  // namespace sync_file_system
 
 #endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_METADATA_DATABASE_H_