Implement tail processing for AudioNodes

third_party/WebKit/Source/platform/audio/AudioDelayDSPKernel.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 30 matching lines @@
   void Reset() override;
 
   double MaxDelayTime() const { return max_delay_time_; }
 
   void SetDelayFrames(double number_of_frames) {
     desired_delay_frames_ = number_of_frames;
   }
 
   double TailTime() const override;
   double LatencyTime() const override;
+  bool RequiresTailProcessing() const override;
 
  protected:
   AudioDelayDSPKernel(AudioDSPKernelProcessor*,
                       size_t processing_size_in_frames);
 
   virtual bool HasSampleAccurateValues();
   virtual void CalculateSampleAccurateValues(float* delay_times,
                                              size_t frames_to_process);
   virtual double DelayTime(float sample_rate);
 
   AudioFloatArray buffer_;
   double max_delay_time_;
   int write_index_;
   double current_delay_time_;
   double smoothing_rate_;
   bool first_time_;
   double desired_delay_frames_;
 
   AudioFloatArray delay_times_;
 
   size_t BufferLengthForDelay(double delay_time, double sample_rate) const;
 };
 
 }  // namespace blink
 
 #endif  // AudioDelayDSPKernel_h