Trace where timers were scheduled in Blink

Source/modules/mediastream/RTCDTMFSender.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 132 matching lines @@
 {
     m_stopped = true;
     m_handler->setClient(0);
 }
 
 void RTCDTMFSender::scheduleDispatchEvent(PassRefPtr<Event> event)
 {
     m_scheduledEvents.append(event);
 
     if (!m_scheduledEventTimer.isActive())
-        m_scheduledEventTimer.startOneShot(0);
+        m_scheduledEventTimer.startOneShot(0, FROM_HERE);
 }
 
 void RTCDTMFSender::scheduledEventTimerFired(Timer<RTCDTMFSender>*)
 {
     if (m_stopped)
         return;
 
     Vector<RefPtr<Event> > events;
     events.swap(m_scheduledEvents);
 
     Vector<RefPtr<Event> >::iterator it = events.begin();
     for (; it != events.end(); ++it)
         dispatchEvent((*it).release());
 }
 
 } // namespace WebCore