Add support for Rec709 color space videos in software YUV convert path.

media/base/yuv_convert.cc

Index: media/base/yuv_convert.cc
diff --git a/media/base/yuv_convert.cc b/media/base/yuv_convert.cc
index 431183abb398c71db8e8fae9e605bf69e2597b8a..25fb8be1927a337686aebb11715cef3efc74f857 100644
--- a/media/base/yuv_convert.cc
+++ b/media/base/yuv_convert.cc
@@ -127,6 +127,7 @@ int GetVerticalShift(YUVType type) {
       return 0;
     case YV12:
     case YV12J:
+    case YV12HD:
       return 1;
   }
   NOTREACHED();
@@ -140,6 +141,8 @@ const int16 (&GetLookupTable(YUVType type))[1024][4] {
       return kCoefficientsRgbY;
     case YV12J:
       return kCoefficientsRgbY_JPEG;
+    case YV12HD:
+      return kCoefficientsRgbY_Rec709;
   }
   NOTREACHED();
   return kCoefficientsRgbY;