Implement Worker-MainThread bridge for FileSystem API in Chrome

content/renderer/renderer_webkitplatformsupport_impl.cc

 // 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.
 
 #include "content/renderer/renderer_webkitplatformsupport_impl.h"
 
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/lazy_instance.h"
 #include "base/message_loop/message_loop_proxy.h"
@@ skipping 378 matching lines @@
   if (!web_idb_factory_)
     web_idb_factory_.reset(
         new RendererWebIDBFactoryImpl(thread_safe_sender_.get()));
   return web_idb_factory_.get();
 }
 
 //------------------------------------------------------------------------------
 
 WebFileSystem* RendererWebKitPlatformSupportImpl::fileSystem() {
   if (!web_file_system_)
-    web_file_system_.reset(new WebFileSystemImpl());
+    web_file_system_.reset(new WebFileSystemImpl(child_thread_loop_));
   return web_file_system_.get();
 }
 
 //------------------------------------------------------------------------------
 
 WebMimeRegistry::SupportsType
 RendererWebKitPlatformSupportImpl::MimeRegistry::supportsMediaMIMEType(
     const WebString& mime_type,
     const WebString& codecs) {
   return supportsMediaMIMEType(mime_type, codecs, WebString());
@@ skipping 656 matching lines @@
 void RendererWebKitPlatformSupportImpl::setDeviceMotionListener(
     WebKit::WebDeviceMotionListener* listener) {
   if (!device_motion_event_pump_) {
     device_motion_event_pump_.reset(new DeviceMotionEventPump);
     device_motion_event_pump_->Attach(RenderThreadImpl::current());
   }
   device_motion_event_pump_->SetListener(listener);
 }
 
 }  // namespace content