[BlobAsync] Renderer support for blob file writing.

content/renderer/render_thread_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/render_thread_impl.h"
 
 #include <algorithm>
 #include <limits>
 #include <map>
 #include <utility>
@@ skipping 631 matching lines @@
   // Note: This may reorder messages from the ResourceDispatcher with respect to
   // other subsystems.
   resource_dispatch_throttler_.reset(new ResourceDispatchThrottler(
       static_cast<RenderThread*>(this), renderer_scheduler_.get(),
       base::TimeDelta::FromSecondsD(kThrottledResourceRequestFlushPeriodS),
       kMaxResourceRequestsPerFlushWhenThrottled));
   resource_dispatcher()->set_message_sender(resource_dispatch_throttler_.get());
 
   media_stream_center_ = NULL;
 
-  blob_message_filter_ = new BlobMessageFilter();
+  blob_message_filter_ = new BlobMessageFilter(GetFileThreadMessageLoopProxy());
   AddFilter(blob_message_filter_.get());
   db_message_filter_ = new DBMessageFilter();
   AddFilter(db_message_filter_.get());
 
   vc_manager_.reset(new VideoCaptureImplManager());
   AddFilter(vc_manager_->video_capture_message_filter());
 
   browser_plugin_manager_.reset(new BrowserPluginManager());
   AddObserver(browser_plugin_manager_.get());
 
@@ skipping 1441 matching lines @@
       v8_memory_pressure_level == v8::MemoryPressureLevel::kCritical)
     v8_memory_pressure_level = v8::MemoryPressureLevel::kModerate;
 
   blink::mainThreadIsolate()->MemoryPressureNotification(
       v8_memory_pressure_level);
   blink::MemoryPressureNotificationToWorkerThreadIsolates(
       v8_memory_pressure_level);
 }
 
 }  // namespace content