Use a shared thread for media operations.

content/renderer/render_view_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_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/auto_reset.h"
@@ skipping 2733 matching lines @@
     if (!factories_loop)
       factories_loop = base::MessageLoopProxy::current();
     GpuChannelHost* gpu_channel_host =
         RenderThreadImpl::current()->EstablishGpuChannelSync(
             CAUSE_FOR_GPU_LAUNCH_VIDEODECODEACCELERATOR_INITIALIZE);
     gpu_factories = new RendererGpuVideoDecoderFactories(
         gpu_channel_host, factories_loop, context3d);
   }
 
   webkit_media::WebMediaPlayerParams params(
+      RenderThreadImpl::current()->GetMediaThreadMessageLoopProxy(),
       sink, gpu_factories, new RenderMediaLog());
   WebMediaPlayer* media_player =
       GetContentClient()->renderer()->OverrideCreateWebMediaPlayer(
           this, frame, client, AsWeakPtr(), params);
   if (!media_player) {
     media_player = new webkit_media::WebMediaPlayerImpl(
         frame, client, AsWeakPtr(), params);
   }
   return media_player;
 }
@@ skipping 3762 matching lines @@
     WebURL url = icon_urls[i].iconURL();
     if (!url.isEmpty())
       urls.push_back(FaviconURL(url,
                                 ToFaviconType(icon_urls[i].iconType())));
   }
   SendUpdateFaviconURL(urls);
 }
 
 
 }  // namespace content