Implement suspend/resume for AudioContext

Source/modules/webaudio/OfflineAudioDestinationNode.cpp

 /*
  * Copyright (C) 2011, 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:
  * 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 74 matching lines @@
     if (!m_renderTarget.get())
         return;
 
     if (!m_startedRendering) {
         m_startedRendering = true;
         m_renderThread = adoptPtr(blink::Platform::current()->createThread("Offline Audio Renderer"));
         m_renderThread->postTask(new Task(bind(&OfflineAudioDestinationNode::offlineRender, this)));
     }
 }
 
+void OfflineAudioDestinationNode::stopRendering()
+{
+    ASSERT_NOT_REACHED();
+}
+
 void OfflineAudioDestinationNode::offlineRender()
 {
     ASSERT(!isMainThread());
     ASSERT(m_renderBus.get());
     if (!m_renderBus.get())
         return;
 
     bool isAudioContextInitialized = context()->isInitialized();
     ASSERT(isAudioContextInitialized);
     if (!isAudioContextInitialized)
@@ skipping 43 matching lines @@
 
 void OfflineAudioDestinationNode::trace(Visitor* visitor)
 {
     visitor->trace(m_renderTarget);
     AudioDestinationNode::trace(visitor);
 }
 
 } // namespace blink
 
 #endif // ENABLE(WEB_AUDIO)