SyncFS: Introduce SyncFileSystemBackend

chrome/browser/media_galleries/fileapi/media_file_system_backend.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/media_file_system_backend.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
@@ skipping 85 matching lines @@
 #if defined(OS_WIN) || defined(OS_MACOSX)
     case fileapi::kFileSystemTypePicasa:
     case fileapi::kFileSystemTypeItunes:
 #endif  // defined(OS_WIN) || defined(OS_MACOSX)
       return true;
     default:
       return false;
   }
 }
 
+void MediaFileSystemBackend::Initialize(
+    const fileapi::FileSystemContext* context) {
+}
+
 void MediaFileSystemBackend::InitializeFileSystem(
     const GURL& origin_url,
     fileapi::FileSystemType type,
     fileapi::OpenFileSystemMode mode,
     fileapi::FileSystemContext* context,
     const InitializeFileSystemCallback& callback) {
   // We never allow opening a new isolated FileSystem via usual OpenFileSystem.
   base::MessageLoopProxy::current()->PostTask(
       FROM_HERE,
       base::Bind(callback,
@@ skipping 90 matching lines @@
           url.path(), offset));
 }
 
 fileapi::FileSystemQuotaUtil*
 MediaFileSystemBackend::GetQuotaUtil() {
   // No quota support.
   return NULL;
 }
 
 }  // namespace chrome