Trace where timers were scheduled in Blink

Source/core/html/HTMLMediaElement.cpp

 /*
  * Copyright (C) 2007, 2008, 2009, 2010, 2011, 2012, 2013 Apple 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 483 matching lines @@
 
     if ((actionType & LoadMediaResource) && !(m_pendingActionFlags & LoadMediaResource)) {
         prepareForLoad();
         m_pendingActionFlags |= LoadMediaResource;
     }
 
     if (RuntimeEnabledFeatures::videoTrackEnabled() && (actionType & LoadTextTrackResource))
         m_pendingActionFlags |= LoadTextTrackResource;
 
     if (!m_loadTimer.isActive())
-        m_loadTimer.startOneShot(0);
+        m_loadTimer.startOneShot(0, FROM_HERE);
 }
 
 void HTMLMediaElement::scheduleNextSourceChild()
 {
     // Schedule the timer to try the next <source> element WITHOUT resetting state ala prepareForLoad.
     m_pendingActionFlags |= LoadMediaResource;
-    m_loadTimer.startOneShot(0);
+    m_loadTimer.startOneShot(0, FROM_HERE);
 }
 
 void HTMLMediaElement::scheduleEvent(const AtomicString& eventName)
 {
     scheduleEvent(Event::createCancelable(eventName));
 }
 
 void HTMLMediaElement::scheduleEvent(PassRefPtr<Event> event)
 {
 #if LOG_MEDIA_EVENTS
@@ skipping 784 matching lines @@
     return true;
 }
 
 void HTMLMediaElement::startProgressEventTimer()
 {
     if (m_progressEventTimer.isActive())
         return;
 
     m_previousProgressTime = WTF::currentTime();
     // 350ms is not magic, it is in the spec!
-    m_progressEventTimer.startRepeating(0.350);
+    m_progressEventTimer.startRepeating(0.350, FROM_HERE);
 }
 
 void HTMLMediaElement::waitForSourceChange()
 {
     WTF_LOG(Media, "HTMLMediaElement::waitForSourceChange");
 
     stopPeriodicTimers();
     m_loadState = WaitingForSource;
 
     // 6.17 - Waiting: Set the element's networkState attribute to the NETWORK_NO_SOURCE value
@@ skipping 802 matching lines @@
 // The spec says to fire periodic timeupdate events (those sent while playing) every
 // "15 to 250ms", we choose the slowest frequency
 static const double maxTimeupdateEventFrequency = 0.25;
 
 void HTMLMediaElement::startPlaybackProgressTimer()
 {
     if (m_playbackProgressTimer.isActive())
         return;
 
     m_previousProgressTime = WTF::currentTime();
-    m_playbackProgressTimer.startRepeating(maxTimeupdateEventFrequency);
+    m_playbackProgressTimer.startRepeating(maxTimeupdateEventFrequency, FROM_HERE);
 }
 
 void HTMLMediaElement::playbackProgressTimerFired(Timer<HTMLMediaElement>*)
 {
     ASSERT(m_player);
 
     if (m_fragmentEndTime != MediaPlayer::invalidTime() && currentTime() >= m_fragmentEndTime && m_playbackRate > 0) {
         m_fragmentEndTime = MediaPlayer::invalidTime();
         if (!m_mediaController && !m_paused) {
             UseCounter::count(document(), UseCounter::HTMLMediaElementPauseAtFragmentEnd);
@@ skipping 1482 matching lines @@
 {
     m_mediaSource->setWebMediaSourceAndOpen(adoptPtr(webMediaSource));
 }
 
 bool HTMLMediaElement::isInteractiveContent() const
 {
     return fastHasAttribute(controlsAttr);
 }
 
 }