Introduce Dolby Vision video codec and Demuxer support

chromecast/media/base/media_codec_support.h

Index: chromecast/media/base/media_codec_support.h
diff --git a/chromecast/media/base/media_codec_support.h b/chromecast/media/base/media_codec_support.h
index cbbf67ca3e9294c2aec636dce3633a04c9af8dc5..ed56ad960ebe991d97df35127811c26e0d036461 100644
--- a/chromecast/media/base/media_codec_support.h
+++ b/chromecast/media/base/media_codec_support.h
@@ -24,7 +24,15 @@ namespace media {
 // representation of the codec id conforming to RFC 6381) is supported or not.
 ::media::IsCodecSupportedCB GetIsCodecSupportedOnChromecastCB();
 
-VideoCodec ToCastVideoCodec(const ::media::VideoCodec codec);
+// Converts ::media::VideoCodec to chromecast::media::VideoCodec. Any unknown or
+// unsupported codec will be converted to chromecast::media::kCodecUnknown. Note
+// |codec_profile| is ignored for codecs other than Dolby Vision.
+// TODO(erickung): Remove |codec_profile| parameter by changing VideoCodec enum
+// to align with ::media::VideoCodecs.
+VideoCodec ToCastVideoCodec(const ::media::VideoCodec codec,
+                            const ::media::VideoCodecProfile codec_profile);
+
+// Converts ::media::VideoCodecProfile to chromecast::media::VideoProfile.
 VideoProfile ToCastVideoProfile(const ::media::VideoCodecProfile profile);
 CodecProfileLevel ToCastCodecProfileLevel(
     const ::media::CodecProfileLevel& codec_profile_level);