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 06289b058a48a541ec59a092755fe737e11265d1..2ff5b726bec7c5fb52a813062f454bb9a0f55e07 100644
--- a/media/base/yuv_convert.cc
+++ b/media/base/yuv_convert.cc
@@ -123,6 +123,7 @@ int GetVerticalShift(YUVType type) {
       return 0;
     case YV12:
     case YV12J:
+    case YV12HD:
       return 1;
   }
   NOTREACHED();
@@ -136,6 +137,8 @@ const int16 (&GetLookupTable(YUVType type))[1024][4] {
       return kCoefficientsRgbY;
     case YV12J:
       return kCoefficientsRgbY_JPEG;
+    case YV12HD:
+      return kCoefficientsRgbY_Rec709;
   }
   NOTREACHED();
   return kCoefficientsRgbY;