Implement tail processing for AudioNodes

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

 /*
  * Copyright (C) 2010, 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 64 matching lines @@
   void GetByteTimeDomainData(DOMUint8Array* array) {
     analyser_.GetByteTimeDomainData(array);
   }
 
   // AnalyserNode needs special handling when updating the pull status
   // because the node must get pulled even if there are no inputs or
   // outputs so that the internal state is properly updated with the
   // correct time data.
   void UpdatePullStatus() override;
 
+  bool RequiresTailProcessing() const override;
+  double TailTime() const override;
+
  private:
   AnalyserHandler(AudioNode&, float sample_rate);
   bool PropagatesSilence() const {
     // An AnalyserNode does actually propogate silence, but to get the
     // time and FFT data updated correctly, process() needs to be
     // called even if all the inputs are silent.
     return false;
   }
 
   RealtimeAnalyser analyser_;
@@ skipping 25 matching lines @@
  private:
   AnalyserNode(BaseAudioContext&);
   AnalyserHandler& GetAnalyserHandler() const;
 
   void SetMinMaxDecibels(double min, double max, ExceptionState&);
 };
 
 }  // namespace blink
 
 #endif  // AnalyserNode_h