Lazy initialization of the rendering thread in OfflineAudioContext

third_party/WebKit/Source/modules/webaudio/OfflineAudioDestinationNode.h

 /*
  * 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 55 matching lines @@
   double SampleRate() const override { return render_target_->sampleRate(); }
   int FramesPerBuffer() const override {
     NOTREACHED();
     return 0;
   }
 
   size_t RenderQuantumFrames() const {
     return AudioUtilities::kRenderQuantumFrames;
   }
 
+  void InitializeOfflineRenderThread();
   WebThread* OfflineRenderThread();
 
  private:
   OfflineAudioDestinationHandler(AudioNode&, AudioBuffer* render_target);
 
   // Set up the rendering and start. After setting the context up, it will
   // eventually call |doOfflineRendering|.
   void StartOfflineRendering();
 
   // Suspend the rendering loop and notify the main thread to resolve the
@@ skipping 47 matching lines @@
   static OfflineAudioDestinationNode* Create(BaseAudioContext*,
                                              AudioBuffer* render_target);
 
  private:
   OfflineAudioDestinationNode(BaseAudioContext&, AudioBuffer* render_target);
 };
 
 }  // namespace blink
 
 #endif  // OfflineAudioDestinationNode_h