Extend PlatformSpeechSynthesizerMock with an utterance queue.

Source/modules/speech/SpeechRecognition.cpp

Index: Source/modules/speech/SpeechRecognition.cpp
diff --git a/Source/modules/speech/SpeechRecognition.cpp b/Source/modules/speech/SpeechRecognition.cpp
index e4876278fa82991a670bc812120f43681137fa3d..2127037d7b2fc08eb6faf4aa2e66e8b4af9d7090 100644
--- a/Source/modules/speech/SpeechRecognition.cpp
+++ b/Source/modules/speech/SpeechRecognition.cpp
@@ -54,7 +54,7 @@ void SpeechRecognition::start(ExceptionState& exceptionState)
     }
 
     m_finalResults.clear();
-    m_controller->start(this, m_grammars.get(), m_lang, m_continuous, m_interimResults, m_maxAlternatives, m_audioTrack);
+    m_controller->start(this, m_grammars, m_lang, m_continuous, m_interimResults, m_maxAlternatives, m_audioTrack);
     m_started = true;
 }