Trace where timers were scheduled in Blink

Source/core/xml/XMLHttpRequestProgressEventThrottle.cpp

 /*
  * Copyright (C) 2010 Julien Chaffraix <jchaffraix@webkit.org>  All right reserved.
  * Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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
@@ skipping 47 matching lines @@
 
     if (!isActive()) {
         // The timer is not active so the least frequent event for now is every byte.
         // Just go ahead and dispatch the event.
 
         // We should not have any pending loaded & total information from a previous run.
         ASSERT(!m_loaded);
         ASSERT(!m_total);
 
         dispatchEvent(XMLHttpRequestProgressEvent::create(EventTypeNames::progress, lengthComputable, loaded, total));
-        startRepeating(minimumProgressEventDispatchingIntervalInSeconds);
+        startRepeating(minimumProgressEventDispatchingIntervalInSeconds, FROM_HERE);
         return;
     }
 
     // The timer is already active so minimumProgressEventDispatchingIntervalInSeconds is the least frequent event.
     m_lengthComputable = lengthComputable;
     m_loaded = loaded;
     m_total = total;
 }
 
 void XMLHttpRequestProgressEventThrottle::dispatchReadyStateChangeEvent(PassRefPtr<Event> event, ProgressEventAction progressEventAction)
@@ skipping 127 matching lines @@
 
     if (m_deferredEvents.isEmpty() && !m_deferredProgressEvent) {
         m_deferEvents = false;
         return;
     }
 
     // Do not dispatch events inline here, since ExecutionContext is iterating over
     // the list of active DOM objects to resume them, and any activated JS event-handler
     // could insert new active DOM objects to the list.
     // m_deferEvents is kept true until all deferred events have been dispatched.
-    m_dispatchDeferredEventsTimer.startOneShot(0);
+    m_dispatchDeferredEventsTimer.startOneShot(0, FROM_HERE);
 }
 
 } // namespace WebCore