Implement browser-side logging to WebRtc log

content/browser/renderer_host/render_process_host_impl.h

Index: content/browser/renderer_host/render_process_host_impl.h
diff --git a/content/browser/renderer_host/render_process_host_impl.h b/content/browser/renderer_host/render_process_host_impl.h
index 73522cb58019a57e8f626a7ef5c66dcf4b622422..fd8b7668debc9b276e03e3bde818082bc46593d5 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -124,6 +124,9 @@ class CONTENT_EXPORT RenderProcessHostImpl
 #if defined(ENABLE_WEBRTC)
   virtual void EnableAecDump(const base::FilePath& file) OVERRIDE;
   virtual void DisableAecDump() OVERRIDE;
+  virtual void SetWebRtcLogMessageCallback(
+      base::Callback<void(const std::string&)> callback) OVERRIDE;
+  virtual void WebRtcLogMessage(const std::string& message) OVERRIDE;
 #endif
 
   // IPC::Sender via RenderProcessHost.
@@ -389,6 +392,10 @@ class CONTENT_EXPORT RenderProcessHostImpl
   // Message filter for geolocation messages.
   GeolocationDispatcherHost* geolocation_dispatcher_host_;
 
+#if defined(ENABLE_WEBRTC)
+  base::Callback<void(const std::string&)> webrtc_log_message_callback_;
+#endif
+
   // Lives on the browser's ChildThread.
   base::WeakPtrFactory<RenderProcessHostImpl> weak_factory_;