Add support for the Rec601 YUV color space to GrYUVtoRGBEffect.

src/gpu/effects/GrYUVtoRGBEffect.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrYUVtoRGBEffect_DEFINED
 #define GrYUVtoRGBEffect_DEFINED
 
+#include "SkImageInfo.h"
+
 class GrEffect;
 class GrTexture;
 
 namespace GrYUVtoRGBEffect {
     /**
      * Creates an effect that performs color conversion from YUV to RGB
      */
-    GrEffect* Create(GrTexture* yTexture, GrTexture* uTexture, GrTexture* vTexture);
+    GrEffect* Create(GrTexture* yTexture, GrTexture* uTexture, GrTexture* vTexture,
+                     SkYUVColorSpace colorSpace);
 };
 
 #endif