Skia side RGB to YUV gpu conversion

include/core/SkPixelRef.h

Index: include/core/SkPixelRef.h
diff --git a/include/core/SkPixelRef.h b/include/core/SkPixelRef.h
index 263145ba3d90baefabd5552cefed18892fed1c02..d7442cfbd73c04f5fdc91d9ef3f85bf577238985 100644
--- a/include/core/SkPixelRef.h
+++ b/include/core/SkPixelRef.h
@@ -14,6 +14,7 @@
 #include "SkString.h"
 #include "SkFlattenable.h"
 #include "SkImageInfo.h"
+#include "SkSize.h"
 #include "SkTDArray.h"
 
 //#define xed
@@ -227,6 +228,18 @@ public:
      */
     virtual GrTexture* getTexture() { return NULL; }
 
+    /**
+     *  If any planes or rowBytes is NULL, this should output the sizes and return true
+     *  if it can efficiently return YUV planar data. If it cannot, it should return false.
+     *
+     *  If all planes and rowBytes are not NULL, then it should copy the associated Y,U,V data
+     *  into those planes of memory supplied by the caller. It should validate that the sizes
+     *  match what it expected. If the sizes do not match, it should return false.
+     */
+    virtual bool getYUV8Planes(SkISize sizes[3], void* planes[3], size_t rowBytes[3]) {
+        return false;
+    }
+
     bool readPixels(SkBitmap* dst, const SkIRect* subset = NULL);
 
     /**