Trace where timers were scheduled in Blink

Source/modules/device_orientation/DeviceSensorEventController.cpp

 /*
  * Copyright 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Samsung Electronics. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *  * Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  *  * Redistributions in binary form must reproduce the above copyright
@@ skipping 61 matching lines @@
     }
 }
 
 void DeviceSensorEventController::startUpdating()
 {
     if (m_isActive)
         return;
 
     if (hasLastData() && !m_timer.isActive()) {
         // Make sure to fire the device motion data as soon as possible.
-        m_timer.startOneShot(0);
+        m_timer.startOneShot(0, FROM_HERE);
     }
 
     registerWithDispatcher();
     m_isActive = true;
 }
 
 void DeviceSensorEventController::stopUpdating()
 {
     if (!m_isActive)
         return;
@@ skipping 10 matching lines @@
     if (!m_hasEventListener)
         return;
 
     if (page()->visibilityState() == PageVisibilityStateVisible)
         startUpdating();
     else
         stopUpdating();
 }
 
 } // namespace WebCore