Add support for onvoiceschanged event.

Source/modules/speech/SpeechSynthesis.cpp

 /*
  * Copyright (C) 2013 Apple Inc. All rights reserved.
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  * modification, are permitted provided that the following conditions
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  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
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 #include "config.h"
 #include "modules/speech/SpeechSynthesis.h"
 
 #include "bindings/v8/ExceptionState.h"
+#include "core/dom/ExecutionContext.h"
 #include "core/platform/PlatformSpeechSynthesisVoice.h"
 #include "core/platform/PlatformSpeechSynthesizer.h"
 #include "modules/speech/SpeechSynthesisEvent.h"
 #include "modules/speech/SpeechSynthesisUtterance.h"
 #include "wtf/CurrentTime.h"
 
 namespace WebCore {
 
-PassRefPtr<SpeechSynthesis> SpeechSynthesis::create()
+PassRefPtr<SpeechSynthesis> SpeechSynthesis::create(ExecutionContext* context)
 {
-    return adoptRef(new SpeechSynthesis());
+    return adoptRef(new SpeechSynthesis(context));
 }
 
-SpeechSynthesis::SpeechSynthesis()
-    : m_platformSpeechSynthesizer(PlatformSpeechSynthesizer::create(this))
+SpeechSynthesis::SpeechSynthesis(ExecutionContext* context)
+    : ContextLifecycleObserver(context)
+    , m_platformSpeechSynthesizer(PlatformSpeechSynthesizer::create(this))
     , m_currentSpeechUtterance(0)
     , m_isPaused(false)
 {
     ScriptWrappable::init(this);
 }
 
 void SpeechSynthesis::setPlatformSynthesizer(PassOwnPtr<PlatformSpeechSynthesizer> synthesizer)
 {
     m_platformSpeechSynthesizer = synthesizer;
 }
 
+ExecutionContext* SpeechSynthesis::executionContext() const
+{
+    return ContextLifecycleObserver::executionContext();
+}
+
 void SpeechSynthesis::voicesDidChange()
 {
     m_voiceList.clear();
+    if (!executionContext()->activeDOMObjectsAreStopped())
+        dispatchEvent(Event::create(EventTypeNames::voiceschanged));
 }
 
 const Vector<RefPtr<SpeechSynthesisVoice> >& SpeechSynthesis::getVoices()
 {
     if (m_voiceList.size())
         return m_voiceList;
 
     // If the voiceList is empty, that's the cue to get the voices from the platform again.
     const Vector<RefPtr<PlatformSpeechSynthesisVoice> >& platformVoices = m_platformSpeechSynthesizer->voiceList();
     size_t voiceCount = platformVoices.size();
@@ skipping 66 matching lines @@
 
 void SpeechSynthesis::resume()
 {
     if (!m_currentSpeechUtterance)
         return;
     m_platformSpeechSynthesizer->resume();
 }
 
 void SpeechSynthesis::fireEvent(const AtomicString& type, SpeechSynthesisUtterance* utterance, unsigned long charIndex, const String& name)
 {
-    utterance->dispatchEvent(SpeechSynthesisEvent::create(type, charIndex, (currentTime() - utterance->startTime()), name));
+    if (!executionContext()->activeDOMObjectsAreStopped())
+        utterance->dispatchEvent(SpeechSynthesisEvent::create(type, charIndex, (currentTime() - utterance->startTime()), name));
 }
 
 void SpeechSynthesis::handleSpeakingCompleted(SpeechSynthesisUtterance* utterance, bool errorOccurred)
 {
     ASSERT(utterance);
     ASSERT(m_currentSpeechUtterance);
     m_currentSpeechUtterance = 0;
 
     fireEvent(errorOccurred ? EventTypeNames::error : EventTypeNames::end, utterance, 0, String());
 
@@ skipping 51 matching lines @@
     if (utterance->client())
         handleSpeakingCompleted(static_cast<SpeechSynthesisUtterance*>(utterance->client()), false);
 }
 
 void SpeechSynthesis::speakingErrorOccurred(PassRefPtr<PlatformSpeechSynthesisUtterance> utterance)
 {
     if (utterance->client())
         handleSpeakingCompleted(static_cast<SpeechSynthesisUtterance*>(utterance->client()), true);
 }
 
+const AtomicString& SpeechSynthesis::interfaceName() const
+{
+    return EventTargetNames::SpeechSynthesisUtterance;
+}
+
 } // namespace WebCore