Trace where timers were scheduled in Blink

Source/modules/geolocation/Geolocation.cpp

 /*
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All Rights Reserved.
  * Copyright (C) 2009 Torch Mobile, Inc.
  * Copyright 2010, The Android Open Source Project
  *
  * 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 92 matching lines @@
 {
     // If a fatal error has already been set, stick with it. This makes sure that
     // when permission is denied, this is the error reported, as required by the
     // spec.
     if (m_fatalError)
         return;
 
     m_fatalError = error;
     // An existing timer may not have a zero timeout.
     m_timer.stop();
-    m_timer.startOneShot(0);
+    m_timer.startOneShot(0, FROM_HERE);
 }
 
 void Geolocation::GeoNotifier::setUseCachedPosition()
 {
     m_useCachedPosition = true;
-    m_timer.startOneShot(0);
+    m_timer.startOneShot(0, FROM_HERE);
 }
 
 bool Geolocation::GeoNotifier::hasZeroTimeout() const
 {
     return m_options->hasTimeout() && m_options->timeout() == 0;
 }
 
 void Geolocation::GeoNotifier::runSuccessCallback(Geoposition* position)
 {
     // If we are here and the Geolocation permission is not approved, something has
     // gone horribly wrong.
     if (!m_geolocation->isAllowed())
         CRASH();
 
     m_successCallback->handleEvent(position);
 }
 
 void Geolocation::GeoNotifier::runErrorCallback(PositionError* error)
 {
     if (m_errorCallback)
         m_errorCallback->handleEvent(error);
 }
 
 void Geolocation::GeoNotifier::startTimerIfNeeded()
 {
     if (m_options->hasTimeout())
-        m_timer.startOneShot(m_options->timeout() / 1000.0);
+        m_timer.startOneShot(m_options->timeout() / 1000.0, FROM_HERE);
 }
 
 void Geolocation::GeoNotifier::stopTimer()
 {
     m_timer.stop();
 }
 
 void Geolocation::GeoNotifier::timerFired(Timer<GeoNotifier>*)
 {
     m_timer.stop();
@@ skipping 544 matching lines @@
                 notifier->startTimerIfNeeded();
             else
                 notifier->setFatalError(PositionError::create(PositionError::POSITION_UNAVAILABLE, failedToStartServiceErrorMessage));
         } else {
             notifier->setFatalError(PositionError::create(PositionError::PERMISSION_DENIED, permissionDeniedErrorMessage));
         }
     }
 }
 
 } // namespace WebCore