Adding more detail to MessageQueue::Dispatch logging.

webrtc/api/remoteaudiosource.cc

Index: webrtc/api/remoteaudiosource.cc
diff --git a/webrtc/api/remoteaudiosource.cc b/webrtc/api/remoteaudiosource.cc
index 2d0785a08f1c9a10de8ec24274c64b445222db05..a98f185cd64ee5b0cbb5f7e6e35d114f98ecd916 100644
--- a/webrtc/api/remoteaudiosource.cc
+++ b/webrtc/api/remoteaudiosource.cc
@@ -148,7 +148,7 @@ void RemoteAudioSource::OnData(const AudioSinkInterface::Data& audio) {
 void RemoteAudioSource::OnAudioProviderGone() {
   // Called when the data provider is deleted.  It may be the worker thread
   // in libjingle or may be a different worker thread.
-  main_thread_->Post(new MessageHandler(this));
+  main_thread_->Post(FROM_HERE, new MessageHandler(this));
 }
 
 void RemoteAudioSource::OnMessage(rtc::Message* msg) {