Trace where timers were scheduled in Blink

Source/core/events/DOMWindowEventQueue.cpp

 /*
  * Copyright (C) 2010 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 55 matching lines @@
 bool DOMWindowEventQueue::enqueueEvent(PassRefPtr<Event> event)
 {
     if (m_isClosed)
         return false;
 
     ASSERT(event->target());
     bool wasAdded = m_queuedEvents.add(event).isNewEntry;
     ASSERT_UNUSED(wasAdded, wasAdded); // It should not have already been in the list.
 
     if (!m_pendingEventTimer->isActive())
-        m_pendingEventTimer->startOneShot(0);
+        m_pendingEventTimer->startOneShot(0, FROM_HERE);
 
     return true;
 }
 
 bool DOMWindowEventQueue::cancelEvent(Event* event)
 {
     ListHashSet<RefPtr<Event>, 16>::iterator it = m_queuedEvents.find(event);
     bool found = it != m_queuedEvents.end();
     if (found)
         m_queuedEvents.remove(it);
@@ skipping 34 matching lines @@
 void DOMWindowEventQueue::dispatchEvent(PassRefPtr<Event> event)
 {
     EventTarget* eventTarget = event->target();
     if (eventTarget->toDOMWindow())
         eventTarget->toDOMWindow()->dispatchEvent(event, nullptr);
     else
         eventTarget->dispatchEvent(event);
 }
 
 }