Trace where timers were scheduled in Blink

Source/modules/encryptedmedia/MediaKeys.cpp

 /*
  * Copyright (C) 2013 Apple 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 117 matching lines @@
     // 2.1 Let the keySystem attribute be keySystem.
     ASSERT(!session->keySystem().isEmpty());
     // FIXME: 2.2 Let the state of the session be CREATED.
 
     // 3. Add the new object to an internal list of session objects (not needed).
 
     // 4. Schedule a task to initialize the session, providing type, initData, and the new object.
     m_pendingInitializeNewSessionData.append(InitializeNewSessionData(session, contentType, initData));
 
     if (!m_initializeNewSessionTimer.isActive())
-        m_initializeNewSessionTimer.startOneShot(0);
+        m_initializeNewSessionTimer.startOneShot(0, FROM_HERE);
 
     // 5. Return the new object to the caller.
     return session;
 }
 
 bool MediaKeys::isTypeSupported(const String& keySystem, const String& contentType)
 {
     WTF_LOG(Media, "MediaKeys::isTypeSupported(%s, %s)", keySystem.ascii().data(), contentType.ascii().data());
 
     // 1. If keySystem is null or an empty string, return false and abort these steps.
@@ skipping 50 matching lines @@
 
 void MediaKeys::contextDestroyed()
 {
     ContextLifecycleObserver::contextDestroyed();
 
     // We don't need the CDM anymore.
     m_cdm.clear();
 }
 
 }