Trace where timers were scheduled in Blink

Source/web/WebFrameImpl.cpp

 /*
  * Copyright (C) 2009 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 448 matching lines @@
 class WebFrameImpl::DeferredScopeStringMatches {
 public:
     DeferredScopeStringMatches(WebFrameImpl* webFrame, int identifier, const WebString& searchText, const WebFindOptions& options, bool reset)
         : m_timer(this, &DeferredScopeStringMatches::doTimeout)
         , m_webFrame(webFrame)
         , m_identifier(identifier)
         , m_searchText(searchText)
         , m_options(options)
         , m_reset(reset)
     {
-        m_timer.startOneShot(0.0);
+        m_timer.startOneShot(0.0, FROM_HERE);
     }
 
 private:
     void doTimeout(Timer<DeferredScopeStringMatches>*)
     {
         m_webFrame->callScopeStringMatches(this, m_identifier, m_searchText, m_options, m_reset);
     }
 
     Timer<DeferredScopeStringMatches> m_timer;
     RefPtr<WebFrameImpl> m_webFrame;
@@ skipping 2005 matching lines @@
 
         // There is a possibility that the frame being detached was the only
         // pending one. We need to make sure final replies can be sent.
         flushCurrentScopingEffort(m_findRequestIdentifier);
 
         cancelPendingScopingEffort();
     }
 }
 
 } // namespace blink