Add SpeechSynthesisUtterance attribute on SpeechSynthesisEvent

Source/modules/speech/SpeechSynthesis.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 127 matching lines @@
 void SpeechSynthesis::resume()
 {
     if (!currentSpeechUtterance())
         return;
     m_platformSpeechSynthesizer->resume();
 }
 
 void SpeechSynthesis::fireEvent(const AtomicString& type, SpeechSynthesisUtterance* utterance, unsigned long charIndex, const String& name)
 {
     if (executionContext() && !executionContext()->activeDOMObjectsAreStopped())
-        utterance->dispatchEvent(SpeechSynthesisEvent::create(type, charIndex, (currentTime() - utterance->startTime()), name));
+        utterance->dispatchEvent(SpeechSynthesisEvent::create(type, utterance, charIndex, (currentTime() - utterance->startTime()), name));
 }
 
 void SpeechSynthesis::handleSpeakingCompleted(SpeechSynthesisUtterance* utterance, bool errorOccurred)
 {
     ASSERT(utterance);
 
     bool shouldStartSpeaking = false;
     // If the utterance that completed was the one we're currently speaking,
     // remove it from the queue and start speaking the next one.
     if (utterance == currentSpeechUtterance()) {
@@ skipping 78 matching lines @@
 {
     visitor->trace(m_platformSpeechSynthesizer);
     visitor->trace(m_voiceList);
     visitor->trace(m_utteranceQueue);
     PlatformSpeechSynthesizerClient::trace(visitor);
     RefCountedGarbageCollectedEventTargetWithInlineData<SpeechSynthesis>::trace(visitor);
     ContextLifecycleObserver::trace(visitor);
 }
 
 } // namespace blink