Add ability to extract YUV planes from SkImage

gm/yuvtorgbeffect.cpp

Index: gm/yuvtorgbeffect.cpp
diff --git a/gm/yuvtorgbeffect.cpp b/gm/yuvtorgbeffect.cpp
index 18d799c3f77f8693d6741232de3d7322278a709f..bf4094cf4ff4d6a01a738ca3fbc8373cc51c4ae3 100644
--- a/gm/yuvtorgbeffect.cpp
+++ b/gm/yuvtorgbeffect.cpp
@@ -20,7 +20,7 @@
 #include "SkGradientShader.h"
 #include "batches/GrDrawBatch.h"
 #include "batches/GrRectBatchFactory.h"
-#include "effects/GrYUVtoRGBEffect.h"
+#include "effects/GrYUVEffect.h"
 
 #define YSIZE 8
 #define USIZE 4
@@ -118,12 +118,12 @@ protected:
                 GrPipelineBuilder pipelineBuilder;
                 pipelineBuilder.setXPFactory(
                     GrPorterDuffXPFactory::Create(SkXfermode::kSrc_Mode))->unref();
-                SkAutoTUnref<GrFragmentProcessor> fp(
-                            GrYUVtoRGBEffect::Create(texture[indices[i][0]],
-                                                     texture[indices[i][1]],
-                                                     texture[indices[i][2]],
-                                                     sizes,
-                                                     static_cast<SkYUVColorSpace>(space)));
+                SkAutoTUnref<const GrFragmentProcessor> fp(
+                            GrYUVEffect::CreateYUVToRGB(texture[indices[i][0]],
+                                                        texture[indices[i][1]],
+                                                        texture[indices[i][2]],
+                                                        sizes,
+                                                        static_cast<SkYUVColorSpace>(space)));
                 if (fp) {
                     SkMatrix viewMatrix;
                     viewMatrix.setTranslate(x, y);