Pass in media message loop to VideoRendererBase and enforce calling on the right thread.

webkit/media/webmediaplayer_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 "webkit/media/webmediaplayer_impl.h"
 
 #include <limits>
 #include <string>
 #include <vector>
 
@@ skipping 158 matching lines @@
       FROM_HERE,
       base::Bind(&WebMediaPlayerImpl::IncrementExternallyAllocatedMemory,
                  AsWeakPtr()));
 
   // Also we want to be notified of |main_loop_| destruction.
   main_loop_->AddDestructionObserver(this);
 
   // Create default video renderer.
   scoped_refptr<media::VideoRendererBase> video_renderer =
       new media::VideoRendererBase(
+          pipeline_message_loop,
           base::Bind(&WebMediaPlayerProxy::Repaint, proxy_),
           BIND_TO_RENDER_LOOP(&WebMediaPlayerImpl::SetOpaque),
           true);
   filter_collection_->AddVideoRenderer(video_renderer);
   proxy_->set_frame_provider(video_renderer);
 
   // Create default audio renderer.
   filter_collection_->AddAudioRenderer(
       new media::AudioRendererImpl(new media::NullAudioSink()));
 
@@ skipping 1011 matching lines @@
   return audio_source_provider_;
 }
 
 void WebMediaPlayerImpl::IncrementExternallyAllocatedMemory() {
   DCHECK_EQ(main_loop_, MessageLoop::current());
   incremented_externally_allocated_memory_ = true;
   v8::V8::AdjustAmountOfExternalAllocatedMemory(kPlayerExtraMemory);
 }
 
 }  // namespace webkit_media