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 a9dbcd21cf211321a1bb4f34f48086a82ffb351c..ed13c306a16500986ed9f753435361f09fb818fa 100644
--- a/media/base/video_decoder_config.cc
+++ b/media/base/video_decoder_config.cc
@@ -39,6 +39,11 @@ 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;