Trace where timers were scheduled in Blink

Source/core/html/shadow/MediaControlElements.cpp

 /*
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 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.
@@ skipping 118 matching lines @@
 }
 
 void MediaControlPanelElement::startTimer()
 {
     stopTimer();
 
     // The timer is required to set the property display:'none' on the panel,
     // such that captions are correctly displayed at the bottom of the video
     // at the end of the fadeout transition.
     // FIXME: Racing a transition with a setTimeout like this is wrong.
-    m_transitionTimer.startOneShot(fadeOutDuration);
+    m_transitionTimer.startOneShot(fadeOutDuration, FROM_HERE);
 }
 
 void MediaControlPanelElement::stopTimer()
 {
     if (m_transitionTimer.isActive())
         m_transitionTimer.stop();
 }
 
 void MediaControlPanelElement::transitionTimerFired(Timer<MediaControlPanelElement>*)
 {
@@ skipping 639 matching lines @@
     float fontSize = smallestDimension * 0.05f;
     if (fontSize != m_fontSize) {
         m_fontSize = fontSize;
         setInlineStyleProperty(CSSPropertyFontSize, fontSize, CSSPrimitiveValue::CSS_PX);
     }
 }
 
 // ----------------------------
 
 } // namespace WebCore