Create and add WebRTC filters.

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
diff --git a/content/renderer/render_thread_impl.h b/content/renderer/render_thread_impl.h
index 9eed9b859485fa51ec03df8a36840edc30ec16cf..4708c22b428e93cb5bad51fbc6675f51a8cd22e6 100644
--- a/content/renderer/render_thread_impl.h
+++ b/content/renderer/render_thread_impl.h
@@ -87,6 +87,7 @@ class RenderProcessObserver;
 class VideoCaptureImplManager;
 class WebDatabaseObserverImpl;
 class WebGraphicsContext3DCommandBufferImpl;
+class WebRtcLoggingMessageFilter;
 
 // The RenderThreadImpl class represents a background thread where RenderView
 // instances live.  The RenderThread supports an API that is used by its
@@ -401,6 +402,8 @@ class CONTENT_EXPORT RenderThreadImpl : public RenderThread,
   // Used on multiple threads.
   scoped_refptr<VideoCaptureImplManager> vc_manager_;
 
+  scoped_refptr<WebRtcLoggingMessageFilter> webrtc_logging_message_filter_;
+
   // Used on multiple script execution context threads.
   scoped_ptr<WebDatabaseObserverImpl> web_database_observer_impl_;