ScriptProcessor buffer size should be consistent with callback size

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

Index: third_party/WebKit/Source/modules/webaudio/BaseAudioContext.h
diff --git a/third_party/WebKit/Source/modules/webaudio/BaseAudioContext.h b/third_party/WebKit/Source/modules/webaudio/BaseAudioContext.h
index 74164a74cd4bdf13af1707c44f221ffa425b1cdb..0212fc849739f771d9b12c63b8413f0652fdfe30 100644
--- a/third_party/WebKit/Source/modules/webaudio/BaseAudioContext.h
+++ b/third_party/WebKit/Source/modules/webaudio/BaseAudioContext.h
@@ -141,6 +141,11 @@ class MODULES_EXPORT BaseAudioContext
     return m_destinationNode ? m_destinationNode->handler().sampleRate() : 0;
   }
 
+  size_t callbackBufferSize() const {
+    return m_destinationNode ? m_destinationNode->handler().callbackBufferSize()
+                             : 0;
+  }
+
   String state() const;
   AudioContextState contextState() const { return m_contextState; }
   void throwExceptionForClosedState(ExceptionState&);