Extend PlatformSpeechSynthesizerMock with an utterance queue.

Source/modules/speech/SpeechRecognitionEvent.h

 /*
  * Copyright (C) 2012 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 copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 29 matching lines @@
     DEFINE_WRAPPERTYPEINFO();
 public:
     static PassRefPtrWillBeRawPtr<SpeechRecognitionEvent> create();
     static PassRefPtrWillBeRawPtr<SpeechRecognitionEvent> create(const AtomicString&, const SpeechRecognitionEventInit&);
     virtual ~SpeechRecognitionEvent();
 
     static PassRefPtrWillBeRawPtr<SpeechRecognitionEvent> createResult(unsigned long resultIndex, const HeapVector<Member<SpeechRecognitionResult>>& results);
     static PassRefPtrWillBeRawPtr<SpeechRecognitionEvent> createNoMatch(SpeechRecognitionResult*);
 
     unsigned long resultIndex() const { return m_resultIndex; }
-    SpeechRecognitionResultList* results() const { return m_results.get(); }
+    SpeechRecognitionResultList* results() const { return m_results; }
 
-    // These two methods are here to satisfy the specification which requires these attrubutes to exist.
-    Document* interpretation() { return 0; }
-    Document* emma() { return 0; }
+    // These two methods are here to satisfy the specification which requires these attributes to exist.
+    Document* interpretation() { return nullptr; }
+    Document* emma() { return nullptr; }
 
     // Event
     virtual const AtomicString& interfaceName() const override;
 
     virtual void trace(Visitor*) override;
 
 private:
     SpeechRecognitionEvent();
     SpeechRecognitionEvent(const AtomicString&, const SpeechRecognitionEventInit&);
     SpeechRecognitionEvent(const AtomicString& eventName, unsigned long resultIndex, SpeechRecognitionResultList* results);
 
     unsigned long m_resultIndex;
     PersistentWillBeMember<SpeechRecognitionResultList> m_results;
 };
 
 } // namespace blink
 
 #endif // SpeechRecognitionEvent_h