Skia side RGB to YUV gpu conversion

src/core/SkImageGenerator.cpp

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkImageGenerator.h"
 
 #ifndef SK_SUPPORT_LEGACY_IMAGEGENERATORAPI
@@ skipping 39 matching lines @@
 
 bool SkImageGenerator::getPixels(const SkImageInfo& info, void* pixels, size_t rowBytes) {
     SkASSERT(kIndex_8_SkColorType != info.colorType());
     if (kIndex_8_SkColorType == info.colorType()) {
         return false;
     }
     return this->getPixels(info, pixels, rowBytes, NULL, NULL);
 }
 #endif
 
+bool SkImageGenerator::getYUV8Planes(SkISize* sizes, void* planes) {
+    return this->onGetYUV8Planes(sizes, planes);
+}
+
+bool SkImageGenerator::onGetYUV8Planes(SkISize*, void*) {
+    return false;
+}
+
 /////////////////////////////////////////////////////////////////////////////////////////////
 
 SkData* SkImageGenerator::onRefEncodedData() {
     return NULL;
 }
 
 bool SkImageGenerator::onGetInfo(SkImageInfo*) {
     return false;
 }
 
 bool SkImageGenerator::onGetPixels(const SkImageInfo&, void*, size_t, SkPMColor*, int*) {
     return false;
 }