new API for retrieving YUV data

src/core/SkPixelRef.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkPixelRef.h"
 #include "SkThread.h"
 
@@ skipping 245 matching lines @@
 }
 
 bool SkPixelRef::onReadPixels(SkBitmap* dst, const SkIRect* subset) {
     return false;
 }
 
 SkData* SkPixelRef::onRefEncodedData() {
     return NULL;
 }
 
-bool SkPixelRef::onGetYUV8Planes(SkISize sizes[3], void* planes[3], size_t rowBytes[3],
-                                 SkYUVColorSpace* colorSpace) {
-    return false;
-}
-
 size_t SkPixelRef::getAllocatedSizeInBytes() const {
     return 0;
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 #ifdef SK_BUILD_FOR_ANDROID
 void SkPixelRef::globalRef(void* data) {
     this->ref();
 }
 
 void SkPixelRef::globalUnref() {
     this->unref();
 }
 #endif