Trace where timers were scheduled in Blink

Source/core/html/HTMLTrackElement.cpp

 /*
  * Copyright (C) 2011 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 144 matching lines @@
 
     // 2. If the text track's text track mode is not set to one of hidden or showing, abort these steps.
     if (ensureTrack()->mode() != TextTrack::hiddenKeyword() && ensureTrack()->mode() != TextTrack::showingKeyword())
         return;
 
     // 3. If the text track's track element does not have a media element as a parent, abort these steps.
     if (!mediaElement())
         return;
 
     // 4. Run the remainder of these steps asynchronously, allowing whatever caused these steps to run to continue.
-    m_loadTimer.startOneShot(0);
+    m_loadTimer.startOneShot(0, FROM_HERE);
 }
 
 void HTMLTrackElement::loadTimerFired(Timer<HTMLTrackElement>*)
 {
     if (!fastHasAttribute(srcAttr))
         return;
 
     WTF_LOG(Media, "HTMLTrackElement::loadTimerFired");
 
     // 6. Set the text track readiness state to loading.
@@ skipping 90 matching lines @@
 
 HTMLMediaElement* HTMLTrackElement::mediaElement() const
 {
     Element* parent = parentElement();
     if (parent && parent->isMediaElement())
         return toHTMLMediaElement(parentNode());
     return 0;
 }
 
 }