Implement tail processing for AudioNodes

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

 /*
  * Copyright (C) 2012 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
@@ skipping 63 matching lines @@
     ReleaseStore(&playback_state_, new_state);
   }
 
   bool IsPlayingOrScheduled() const {
     PlaybackState state = GetPlaybackState();
     return state == PLAYING_STATE || state == SCHEDULED_STATE;
   }
 
   bool HasFinished() const { return GetPlaybackState() == FINISHED_STATE; }
 
+  // Source nodes don't have tail or latency times so no tail
+  // processing needed.
+  bool RequiresTailProcessing() const override { return false; }
+
  protected:
   // Get frame information for the current time quantum.
   // We handle the transition into PLAYING_STATE and FINISHED_STATE here,
   // zeroing out portions of the outputBus which are outside the range of
   // startFrame and endFrame.
   //
   // Each frame time is relative to the context's currentSampleFrame().
   // quantumFrameOffset    : Offset frame in this time quantum to start
   //                         rendering.
   // nonSilentFramesToProcess : Number of frames rendering non-silence (will be
@@ skipping 60 matching lines @@
   DEFINE_INLINE_VIRTUAL_TRACE() { AudioNode::Trace(visitor); }
 
  protected:
   explicit AudioScheduledSourceNode(BaseAudioContext&);
   AudioScheduledSourceHandler& GetAudioScheduledSourceHandler() const;
 };
 
 }  // namespace blink
 
 #endif  // AudioScheduledSourceNode_h