Add an option to specify requested fields for fetching metadata.

chrome/browser/media_galleries/fileapi/device_media_async_file_util.cc

 // Copyright (c) 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/media_galleries/fileapi/device_media_async_file_util.h"
 
 #include "base/callback.h"
 #include "base/files/file_util.h"
 #include "base/single_thread_task_runner.h"
 #include "base/task_runner_util.h"
@@ skipping 338 matching lines @@
   delegate->CreateDirectory(
       url.path(), exclusive, recursive,
       base::Bind(&DeviceMediaAsyncFileUtil::OnDidCreateDirectory,
                  weak_ptr_factory_.GetWeakPtr(), callback),
       base::Bind(&OnCreateDirectoryError, callback));
 }
 
 void DeviceMediaAsyncFileUtil::GetFileInfo(
     scoped_ptr<FileSystemOperationContext> context,
     const FileSystemURL& url,
+    int /* flags */,
     const GetFileInfoCallback& callback) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
   MTPDeviceAsyncDelegate* delegate = GetMTPDeviceDelegate(url);
   if (!delegate) {
     OnGetFileInfoError(callback, base::File::FILE_ERROR_NOT_FOUND);
     return;
   }
   delegate->GetFileInfo(
       url.path(),
       base::Bind(&DeviceMediaAsyncFileUtil::OnDidGetFileInfo,
@@ skipping 329 matching lines @@
 void DeviceMediaAsyncFileUtil::OnDidDeleteDirectory(
     const StatusCallback& callback) {
   DCHECK_CURRENTLY_ON(content::BrowserThread::IO);
 
   callback.Run(base::File::FILE_OK);
 }
 
 bool DeviceMediaAsyncFileUtil::validate_media_files() const {
   return media_path_filter_wrapper_.get() != NULL;
 }