Trace where timers were scheduled in Blink

Source/core/loader/PingLoader.cpp

 /*
  * Copyright (C) 2010 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:
  *
  *     * 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
@@ skipping 123 matching lines @@
     m_loader = adoptPtr(blink::Platform::current()->createURLLoader());
     ASSERT(m_loader);
     blink::WrappedResourceRequest wrappedRequest(request);
     wrappedRequest.setAllowStoredCredentials(credentialsAllowed == AllowStoredCredentials);
     m_loader->loadAsynchronously(wrappedRequest, this);
 
     InspectorInstrumentation::willSendRequest(frame, m_identifier, frame->loader().documentLoader(), request, ResourceResponse(), initiatorInfo);
 
     // If the server never responds, FrameLoader won't be able to cancel this load and
     // we'll sit here waiting forever. Set a very generous timeout, just in case.
-    m_timeout.startOneShot(60000);
+    m_timeout.startOneShot(60000, FROM_HERE);
 }
 
 PingLoader::~PingLoader()
 {
     if (m_loader)
         m_loader->cancel();
 }
 
 void PingLoader::didReceiveResponse(blink::WebURLLoader*, const blink::WebURLResponse&)
 {
@@ skipping 24 matching lines @@
 }
 
 void PingLoader::timeout(Timer<PingLoader>*)
 {
     if (Page* page = this->page())
         InspectorInstrumentation::didFailLoading(page->mainFrame(), m_identifier, ResourceError::cancelledError(m_url));
     delete this;
 }
 
 }