ScriptProcessor buffer size should be consistent with callback size

third_party/WebKit/Source/platform/audio/AudioDestination.h

Index: third_party/WebKit/Source/platform/audio/AudioDestination.h
diff --git a/third_party/WebKit/Source/platform/audio/AudioDestination.h b/third_party/WebKit/Source/platform/audio/AudioDestination.h
index a62c38a50fe998f4f87b123016094b928ef92ddb..e986b827e3106ba5eba3deb51b1d7f7e6173b775 100644
--- a/third_party/WebKit/Source/platform/audio/AudioDestination.h
+++ b/third_party/WebKit/Source/platform/audio/AudioDestination.h
@@ -92,6 +92,8 @@ class PLATFORM_EXPORT AudioDestination : public WebAudioDevice::RenderCallback,
 
   static float hardwareSampleRate();
 
+  size_t callbackBufferSize() const { return m_callbackBufferSize; }
+
   // maxChannelCount() returns the total number of output channels of the audio
   // hardware.  A value of 0 indicates that the number of channels cannot be
   // configured and that only stereo (2-channel) destinations can be created.