Implement tail processing for AudioNodes

third_party/WebKit/Source/modules/webaudio/DefaultAudioDestinationNode.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 41 matching lines @@
 
   // AudioDestinationHandler
   void StartRendering() override;
   void StopRendering() override;
   unsigned long MaxChannelCount() const override;
   // Returns the rendering callback buffer size.
   size_t CallbackBufferSize() const override;
   double SampleRate() const override;
   int FramesPerBuffer() const override;
 
-  // AudioNode
   double TailTime() const override { return 0; }
   double LatencyTime() const override { return 0; }
+  bool RequiresTailProcessing() const override { return false; }
 
  private:
   explicit DefaultAudioDestinationHandler(AudioNode&,
                                           const WebAudioLatencyHint&);
   void CreateDestination();
 
   std::unique_ptr<AudioDestination> destination_;
   String input_device_id_;
   unsigned number_of_input_channels_;
   const WebAudioLatencyHint latency_hint_;
 };
 
 class DefaultAudioDestinationNode final : public AudioDestinationNode {
  public:
   static DefaultAudioDestinationNode* Create(BaseAudioContext*,
                                              const WebAudioLatencyHint&);
 
   size_t CallbackBufferSize() const { return Handler().CallbackBufferSize(); };
 
  private:
   explicit DefaultAudioDestinationNode(BaseAudioContext&,
                                        const WebAudioLatencyHint&);
 };
 
 }  // namespace blink
 
 #endif  // DefaultAudioDestinationNode_h