Add an option to specify requested fields for fetching metadata.

chrome/browser/chromeos/drive/fileapi/async_file_util.cc

 // Copyright 2014 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/chromeos/drive/fileapi/async_file_util.h"
 
 #include "base/callback.h"
 #include "base/files/file_path.h"
 #include "base/logging.h"
 #include "base/single_thread_task_runner.h"
@@ skipping 183 matching lines @@
       base::Bind(&fileapi_internal::GetFileSystemFromUrl, url),
       base::Bind(&fileapi_internal::CreateDirectory,
                  file_path, exclusive, recursive,
                  google_apis::CreateRelayCallback(callback)),
       base::Bind(callback, base::File::FILE_ERROR_FAILED));
 }
 
 void AsyncFileUtil::GetFileInfo(
     scoped_ptr<storage::FileSystemOperationContext> context,
     const storage::FileSystemURL& url,
+    int /* fields */,
     const GetFileInfoCallback& callback) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   base::FilePath file_path = util::ExtractDrivePathFromFileSystemUrl(url);
   if (file_path.empty()) {
     callback.Run(base::File::FILE_ERROR_NOT_FOUND, base::File::Info());
     return;
   }
 
   PostFileSystemCallback(
@@ skipping 229 matching lines @@
                      base::Bind(&RunCreateSnapshotFileCallback, callback))),
       base::Bind(callback,
                  base::File::FILE_ERROR_FAILED,
                  base::File::Info(),
                  base::FilePath(),
                  scoped_refptr<storage::ShareableFileReference>()));
 }
 
 }  // namespace internal
 }  // namespace drive