ScriptProcessor buffer size should be consistent with callback size

third_party/WebKit/Source/modules/webaudio/AudioDestinationNode.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 48 matching lines @@
   }
   double currentTime() const {
     return currentSampleFrame() / static_cast<double>(sampleRate());
   }
 
   virtual unsigned long maxChannelCount() const { return 0; }
 
   virtual void startRendering() = 0;
   virtual void stopRendering() = 0;
 
+  // Returns the rendering callback buffer size.
+  virtual size_t callbackBufferSize() const = 0;
+
  protected:
   // LocalAudioInputProvider allows us to expose an AudioSourceProvider for
   // local/live audio input.  If there is local/live audio input, we call set()
   // with the audio input data every render quantum.
   class LocalAudioInputProvider final : public AudioSourceProvider {
    public:
     LocalAudioInputProvider()
         : m_sourceBus(AudioBus::create(
               2,
               AudioUtilities::kRenderQuantumFrames))  // FIXME: handle
@@ skipping 26 matching lines @@
   LocalAudioInputProvider m_localAudioInputProvider;
 };
 
 class AudioDestinationNode : public AudioNode {
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   AudioDestinationHandler& audioDestinationHandler() const;
 
   unsigned long maxChannelCount() const;
+  size_t callbackBufferSize() const { return handler().callbackBufferSize(); }
 
  protected:
   AudioDestinationNode(BaseAudioContext&);
 };
 
 }  // namespace blink
 
 #endif  // AudioDestinationNode_h