Make RendererGpuVideoDecoderFactories live on arbitrary threads.

content/renderer/media/media_stream_dependency_factory.cc

Index: content/renderer/media/media_stream_dependency_factory.cc
diff --git a/content/renderer/media/media_stream_dependency_factory.cc b/content/renderer/media/media_stream_dependency_factory.cc
index f15f1036fbd1830f86fdd17e2544e55cc306aff6..b32348fc774217b4e9c64a89578bf7275b644e19 100644
--- a/content/renderer/media/media_stream_dependency_factory.cc
+++ b/content/renderer/media/media_stream_dependency_factory.cc
@@ -497,10 +497,14 @@ bool MediaStreamDependencyFactory::CreatePeerConnectionFactory() {
 
     const CommandLine* cmd_line = CommandLine::ForCurrentProcess();
     if (cmd_line->HasSwitch(switches::kEnableWebRtcHWDecoding)) {
+      scoped_refptr<base::MessageLoopProxy> media_loop_proxy =
+          RenderThreadImpl::current()->GetMediaThreadMessageLoopProxy();
       scoped_refptr<media::GpuVideoDecoder::Factories> gpu_factories =
-          RenderThreadImpl::current()->GetGpuFactories();
-      if (gpu_factories.get() != NULL)
-        decoder_factory.reset(new RTCVideoDecoderFactory(gpu_factories));
+          RenderThreadImpl::current()->GetGpuFactories(media_loop_proxy);
+      if (gpu_factories.get() != NULL) {
+        decoder_factory.reset(
+            new RTCVideoDecoderFactory(media_loop_proxy, gpu_factories));
+      }
     }
 #if defined(GOOGLE_TV)
     // PeerConnectionFactory will hold the ownership of this