Make RendererGpuVideoDecoderFactories live on arbitrary threads.

content/renderer/media/media_stream_dependency_factory.h

Index: content/renderer/media/media_stream_dependency_factory.h
diff --git a/content/renderer/media/media_stream_dependency_factory.h b/content/renderer/media/media_stream_dependency_factory.h
index 7750276d290018856633649f0a8df3adca1a6254..23e68f04907ac6c6af7e6144a74823bfc5627bcb 100644
--- a/content/renderer/media/media_stream_dependency_factory.h
+++ b/content/renderer/media/media_stream_dependency_factory.h
@@ -9,6 +9,7 @@
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
+#include "base/message_loop/message_loop_proxy.h"

[scherkus (not reviewing), 2013/07/19 18:13:58]

AFAIK you can fwd decl vs include

you may also be able to get rid of |media_loop_proxy_| -- see my comment in .cc

[wuchengli, 2013/07/20 06:04:14]

Done.

 #include "base/threading/thread.h"
 #include "content/common/content_export.h"
 #include "content/renderer/media/media_stream_extra_data.h"
@@ -61,7 +62,8 @@ class CONTENT_EXPORT MediaStreamDependencyFactory
                               bool live)> MediaSourcesCreatedCallback;
   MediaStreamDependencyFactory(
       VideoCaptureImplManager* vc_manager,
-      P2PSocketDispatcher* p2p_socket_dispatcher);
+      P2PSocketDispatcher* p2p_socket_dispatcher,
+      const scoped_refptr<base::MessageLoopProxy>& media_loop_proxy);
   virtual ~MediaStreamDependencyFactory();
 
   // Create a RTCPeerConnectionHandler object that implements the
@@ -231,6 +233,9 @@ class CONTENT_EXPORT MediaStreamDependencyFactory
   talk_base::Thread* worker_thread_;
   base::Thread chrome_worker_thread_;
 
+  // Message loop proxy of the media thread.
+  scoped_refptr<base::MessageLoopProxy> media_loop_proxy_;
+
   DISALLOW_COPY_AND_ASSIGN(MediaStreamDependencyFactory);
 };