ScriptProcessor buffer size should be consistent with callback size

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

Index: third_party/WebKit/Source/modules/webaudio/AudioDestinationNode.h
diff --git a/third_party/WebKit/Source/modules/webaudio/AudioDestinationNode.h b/third_party/WebKit/Source/modules/webaudio/AudioDestinationNode.h
index 65a6743a8735f02c9bceacd867699c71dd82d128..1aa09a97046d2d4f0c96a0e752069827e3798eba 100644
--- a/third_party/WebKit/Source/modules/webaudio/AudioDestinationNode.h
+++ b/third_party/WebKit/Source/modules/webaudio/AudioDestinationNode.h
@@ -66,6 +66,9 @@ class AudioDestinationHandler : public AudioHandler, public AudioIOCallback {
   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()
@@ -112,6 +115,7 @@ class AudioDestinationNode : public AudioNode {
   AudioDestinationHandler& audioDestinationHandler() const;
 
   unsigned long maxChannelCount() const;
+  size_t callbackBufferSize() const { return handler().callbackBufferSize(); }
 
  protected:
   AudioDestinationNode(BaseAudioContext&);