ScriptProcessor buffer size should be consistent with callback size

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

Index: third_party/WebKit/Source/modules/webaudio/DefaultAudioDestinationNode.h
diff --git a/third_party/WebKit/Source/modules/webaudio/DefaultAudioDestinationNode.h b/third_party/WebKit/Source/modules/webaudio/DefaultAudioDestinationNode.h
index d96b3eb67a54cb7e6561bc8e47e2df6253a3717e..b5fd732da74196581ea28a3557ea529ab5bfb507 100644
--- a/third_party/WebKit/Source/modules/webaudio/DefaultAudioDestinationNode.h
+++ b/third_party/WebKit/Source/modules/webaudio/DefaultAudioDestinationNode.h
@@ -50,6 +50,8 @@ class DefaultAudioDestinationHandler final : public AudioDestinationHandler {
   void startRendering() override;
   void stopRendering() override;
   unsigned long maxChannelCount() const override;
+  // Returns the rendering callback buffer size.
+  size_t callbackBufferSize() const override;
 
  private:
   explicit DefaultAudioDestinationHandler(AudioNode&);
@@ -64,6 +66,8 @@ class DefaultAudioDestinationNode final : public AudioDestinationNode {
  public:
   static DefaultAudioDestinationNode* create(BaseAudioContext*);
 
+  size_t callbackBufferSize() const { return handler().callbackBufferSize(); };
+
  private:
   explicit DefaultAudioDestinationNode(BaseAudioContext&);
 };