Add an option to specify requested fields for fetching metadata.

chrome/browser/media_galleries/fileapi/native_media_file_util.h

 // Copyright (c) 2012 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_MEDIA_GALLERIES_FILEAPI_NATIVE_MEDIA_FILE_UTIL_H_
 #define CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_NATIVE_MEDIA_FILE_UTIL_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "storage/browser/fileapi/async_file_util.h"
@@ skipping 38 matching lines @@
   void EnsureFileExists(scoped_ptr<storage::FileSystemOperationContext> context,
                         const storage::FileSystemURL& url,
                         const EnsureFileExistsCallback& callback) override;
   void CreateDirectory(scoped_ptr<storage::FileSystemOperationContext> context,
                        const storage::FileSystemURL& url,
                        bool exclusive,
                        bool recursive,
                        const StatusCallback& callback) override;
   void GetFileInfo(scoped_ptr<storage::FileSystemOperationContext> context,
                    const storage::FileSystemURL& url,
+                   int /* fields */,
                    const GetFileInfoCallback& callback) override;
   void ReadDirectory(scoped_ptr<storage::FileSystemOperationContext> context,
                      const storage::FileSystemURL& url,
                      const ReadDirectoryCallback& callback) override;
   void Touch(scoped_ptr<storage::FileSystemOperationContext> context,
              const storage::FileSystemURL& url,
              const base::Time& last_access_time,
              const base::Time& last_modified_time,
              const StatusCallback& callback) override;
   void Truncate(scoped_ptr<storage::FileSystemOperationContext> context,
@@ skipping 145 matching lines @@
 
   // Not owned, owned by the backend which owns this.
   MediaPathFilter* const media_path_filter_;
 
   base::WeakPtrFactory<NativeMediaFileUtil> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeMediaFileUtil);
 };
 
 #endif  // CHROME_BROWSER_MEDIA_GALLERIES_FILEAPI_NATIVE_MEDIA_FILE_UTIL_H_