Adding more detail to MessageQueue::Dispatch logging.

webrtc/base/signalthread.cc

 /*
  *  Copyright 2004 The WebRTC Project Authors. All rights reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 119 matching lines @@
 
 void SignalThread::Worker::Run() {
   parent_->Run();
 }
 
 void SignalThread::Run() {
   DoWork();
   {
     EnterExit ee(this);
     if (main_) {
-      main_->Post(this, ST_MSG_WORKER_DONE);
+      main_->Post(RTC_FROM_HERE, this, ST_MSG_WORKER_DONE);
     }
   }
 }
 
 void SignalThread::OnMainThreadDestroyed() {
   EnterExit ee(this);
   main_ = NULL;
 }
 
 }  // namespace rtc