Trace where timers were scheduled in Blink

Source/modules/vibration/NavigatorVibration.cpp

 /*
  *  Copyright (C) 2012 Samsung Electronics
  *
  *  This library is free software; you can redistribute it and/or
  *  modify it under the terms of the GNU Library General Public
  *  License as published by the Free Software Foundation; either
  *  version 2 of the License, or (at your option) any later version.
  *
  *  This library is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 65 matching lines @@
         m_timerStart.stop();
 
     if (!m_pattern.size())
         return true;
 
     if (m_pattern.size() == 1 && !m_pattern[0]) {
         m_pattern.clear();
         return true;
     }
 
-    m_timerStart.startOneShot(0);
+    m_timerStart.startOneShot(0, FROM_HERE);
     m_isVibrating = true;
     return true;
 }
 
 void NavigatorVibration::cancelVibration()
 {
     m_pattern.clear();
     if (m_isVibrating) {
         blink::Platform::current()->cancelVibration();
         m_isVibrating = false;
         m_timerStop.stop();
     }
 }
 
 void NavigatorVibration::timerStartFired(Timer<NavigatorVibration>* timer)
 {
     ASSERT_UNUSED(timer, timer == &m_timerStart);
 
     if (m_pattern.size()) {
         m_isVibrating = true;
         blink::Platform::current()->vibrate(m_pattern[0]);
-        m_timerStop.startOneShot(m_pattern[0] / 1000.0);
+        m_timerStop.startOneShot(m_pattern[0] / 1000.0, FROM_HERE);
         m_pattern.remove(0);
     }
 }
 
 void NavigatorVibration::timerStopFired(Timer<NavigatorVibration>* timer)
 {
     ASSERT_UNUSED(timer, timer == &m_timerStop);
 
     if (m_pattern.isEmpty())
         m_isVibrating = false;
 
     if (m_pattern.size()) {
-        m_timerStart.startOneShot(m_pattern[0] / 1000.0);
+        m_timerStart.startOneShot(m_pattern[0] / 1000.0, FROM_HERE);
         m_pattern.remove(0);
     }
 }
 
 void NavigatorVibration::pageVisibilityChanged()
 {
     if (page()->visibilityState() != PageVisibilityStateVisible)
         cancelVibration();
 }
 
@@ skipping 32 matching lines @@
     }
     return *navigatorVibration;
 }
 
 const char* NavigatorVibration::supplementName()
 {
     return "NavigatorVibration";
 }
 
 } // namespace WebCore