Add an option to specify requested fields for fetching metadata.

chrome/browser/sync_file_system/local/local_file_sync_context.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/local/local_file_sync_context.h"
 
 #include "base/bind.h"
 #include "base/files/file_util.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 445 matching lines @@
         FROM_HERE,
         base::Bind(&LocalFileSyncContext::GetFileMetadata, this,
                    make_scoped_refptr(file_system_context), url, callback));
     return;
   }
   DCHECK(io_task_runner_->RunsTasksOnCurrentThread());
 
   FileSystemURL url_for_sync = CreateSyncableFileSystemURLForSync(
       file_system_context, url);
   file_system_context->operation_runner()->GetMetadata(
-      url_for_sync, base::Bind(&LocalFileSyncContext::DidGetFileMetadata,
-                      this, callback));
+      url_for_sync, FileSystemOperation::GET_METADATA_FIELD_IS_DIRECTORY |
+                        FileSystemOperation::GET_METADATA_FIELD_SIZE |
+                        FileSystemOperation::GET_METADATA_FIELD_LAST_MODIFIED,
+      base::Bind(&LocalFileSyncContext::DidGetFileMetadata, this, callback));
 }
 
 void LocalFileSyncContext::HasPendingLocalChanges(
     FileSystemContext* file_system_context,
     const FileSystemURL& url,
     const HasPendingLocalChangeCallback& callback) {
   // This gets called on UI thread and relays the task on FILE thread.
   DCHECK(file_system_context);
   if (!file_system_context->default_file_task_runner()->
           RunsTasksOnCurrentThread()) {
@@ skipping 593 matching lines @@
     return;
   }
 
   FileSystemURL url_for_sync = CreateSyncableFileSystemURLForSync(
       file_system_context, dest_url);
   file_system_context->operation_runner()->CopyInForeignFile(
       local_path, url_for_sync, callback);
 }
 
 }  // namespace sync_file_system