Introduce Dolby Vision video codec and Demuxer support

media/base/video_decoder_config.cc

Index: media/base/video_decoder_config.cc
diff --git a/media/base/video_decoder_config.cc b/media/base/video_decoder_config.cc
index 6e0c61fa372aa48dfbbcf19434a8bc6907884afc..5db22234e09a65897899b1469f8424df53dea732 100644
--- a/media/base/video_decoder_config.cc
+++ b/media/base/video_decoder_config.cc
@@ -40,6 +40,11 @@ VideoCodec VideoCodecProfileToVideoCodec(VideoCodecProfile profile) {
     case VP9PROFILE_PROFILE2:
     case VP9PROFILE_PROFILE3:
       return kCodecVP9;
+    case DOLBYVISION_PROFILE0:
+    case DOLBYVISION_PROFILE4:
+    case DOLBYVISION_PROFILE5:
+    case DOLBYVISION_PROFILE7:
+      return kCodecDolbyVision;
   }
   NOTREACHED();
   return kUnknownVideoCodec;