Add support for the Rec601 YUV color space to GrYUVtoRGBEffect.

include/core/SkImageInfo.h

Index: include/core/SkImageInfo.h
diff --git a/include/core/SkImageInfo.h b/include/core/SkImageInfo.h
index 6204cb3b81ac9903dcb558acd5ea3158fb168eb6..8c0ddb6d2c9cdc5d59aea31b6d36af22192f9ace 100644
--- a/include/core/SkImageInfo.h
+++ b/include/core/SkImageInfo.h
@@ -133,6 +133,19 @@ bool SkColorTypeValidateAlphaType(SkColorType colorType, SkAlphaType alphaType,
 ///////////////////////////////////////////////////////////////////////////////
 
 /**
+ *  Describes the color space a YUV pixel.
+ */
+enum SkYUVColorSpace {
+    /** Standard JPEG color space. */
+    kJPEG_SkYUVColorSpace,
+    /** SDTV standard Rec. 601 color space. Uses "studio swing" [16, 235] color
+       range. See http://en.wikipedia.org/wiki/Rec._601 for details. */
+    kRec601_SkYUVColorSpace
+};
+
+///////////////////////////////////////////////////////////////////////////////
+
+/**
  *  Describe an image's dimensions and pixel type.
  */
 struct SkImageInfo {