Trace where timers were scheduled in Blink

Source/modules/mediastream/MediaStreamTrackSourcesRequestImpl.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 40 matching lines @@
 }
 
 void MediaStreamTrackSourcesRequestImpl::requestSucceeded(const blink::WebVector<blink::WebSourceInfo>& webSourceInfos)
 {
     ASSERT(m_callback && !m_scheduledEventTimer.isActive());
 
     for (size_t i = 0; i < webSourceInfos.size(); ++i)
         m_sourceInfos.append(SourceInfo::create(webSourceInfos[i]));
 
     m_protect = this;
-    m_scheduledEventTimer.startOneShot(0);
+    m_scheduledEventTimer.startOneShot(0, FROM_HERE);
 }
 
 void MediaStreamTrackSourcesRequestImpl::scheduledEventTimerFired(Timer<MediaStreamTrackSourcesRequestImpl>*)
 {
     m_callback->handleEvent(m_sourceInfos);
     m_callback.clear();
     m_protect.release();
 }
 
 } // namespace WebCore