Reland CL to 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..a2d8df52e148c7d3141da328eb2c58a2c6b7c16d 100644
--- a/content/browser/renderer_host/render_process_host_impl.h
+++ b/content/browser/renderer_host/render_process_host_impl.h
@@ -124,6 +124,8 @@ 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;
 #endif
 
   // IPC::Sender via RenderProcessHost.
@@ -165,6 +167,11 @@ class CONTENT_EXPORT RenderProcessHostImpl
     return make_scoped_refptr(geolocation_dispatcher_host_);
   }
 
+#if defined(ENABLE_WEBRTC)
+  // Fires the webrtc log message callback with |message|, if callback is set.
+  void WebRtcLogMessage(const std::string& message);
+#endif
+
   // Register/unregister the host identified by the host id in the global host
   // list.
   static void RegisterHost(int host_id, RenderProcessHost* host);
@@ -389,6 +396,10 @@ 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_;