[SyncFS] Add bulk update method to MetadataDatabase

chrome/browser/sync_file_system/drive_backend/metadata_database.cc

 // 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.
 
 #include "chrome/browser/sync_file_system/drive_backend/metadata_database.h"
 
 #include <algorithm>
 #include <stack>
 
 #include "base/bind.h"
@@ skipping 818 matching lines @@
     const SyncStatusCallback& callback) {
   scoped_ptr<leveldb::WriteBatch> batch(new leveldb::WriteBatch);
 
   scoped_ptr<FileMetadata> file(
       CreateFileMetadataFromFileResource(
           GetLargestKnownChangeID(), resource));
   UpdateByFileMetadata(FROM_HERE, file.Pass(), batch.get());
   WriteToDatabase(batch.Pass(), callback);
 }
 
+void MetadataDatabase::UpdateByFileResourceList(
+    ScopedVector<google_apis::FileResource> resources,
+    const SyncStatusCallback& callback) {
+  scoped_ptr<leveldb::WriteBatch> batch(new leveldb::WriteBatch);
+
+  for (size_t i = 0; i < resources.size(); ++i) {
+    scoped_ptr<FileMetadata> file(
+        CreateFileMetadataFromFileResource(
+            GetLargestKnownChangeID(), *resources[i]));
+    UpdateByFileMetadata(FROM_HERE, file.Pass(), batch.get());
+  }
+  WriteToDatabase(batch.Pass(), callback);
+}
+
 void MetadataDatabase::UpdateByDeletedRemoteFile(
     const std::string& file_id,
     const SyncStatusCallback& callback) {
   scoped_ptr<leveldb::WriteBatch> batch(new leveldb::WriteBatch);
   scoped_ptr<FileMetadata> file(
       CreateDeletedFileMetadata(GetLargestKnownChangeID(), file_id));
   UpdateByFileMetadata(FROM_HERE, file.Pass(), batch.get());
   WriteToDatabase(batch.Pass(), callback);
 }
 
@@ skipping 937 matching lines @@
                                             int64 change_id) {
   FileByID::const_iterator found = file_by_id_.find(file_id);
   if (found == file_by_id_.end())
     return false;
   DCHECK(found->second->has_details());
   return found->second->details().change_id() >= change_id;
 }
 
 }  // namespace drive_backend
 }  // namespace sync_file_system