Introduce Dolby Vision video codec and Demuxer support

media/base/mime_util_internal.cc

Index: media/base/mime_util_internal.cc
diff --git a/media/base/mime_util_internal.cc b/media/base/mime_util_internal.cc
index 7370198ec2419a0dd84f40d87a8139d0bfad2b40..a5345249cb24f750407e9986dc59910e5b8919ad 100644
--- a/media/base/mime_util_internal.cc
+++ b/media/base/mime_util_internal.cc
@@ -151,6 +151,8 @@ VideoCodec MimeUtilToVideoCodec(MimeUtil::Codec codec) {
       return kCodecVP9;
     case MimeUtil::THEORA:
       return kCodecTheora;
+    case MimeUtil::DolbyVision:
+      return kCodecDolbyVision;
     default:
       break;
   }
@@ -269,6 +271,9 @@ void MimeUtil::AddSupportedMediaFormats() {
   // Only VP9 with valid codec string vp09.xx.xx.xx.xx.xx.xx.xx is supported.
   // See ParseVp9CodecID for details.
   mp4_video_codecs.insert(VP9);
+#if BUILDFLAG(ENABLE_DOLBY_VISION_DEMUXING)
+  mp4_video_codecs.insert(DolbyVision);
+#endif  // BUILDFLAG(ENABLE_DOLBY_VISION_DEMUXING)
   CodecSet mp4_codecs(mp4_audio_codecs);
   mp4_codecs.insert(mp4_video_codecs.begin(), mp4_video_codecs.end());
 #endif  // BUILDFLAG(USE_PROPRIETARY_CODECS)
@@ -537,6 +542,11 @@ bool MimeUtil::IsCodecSupportedOnPlatform(
       // MediaPlayer only supports VP9 in WebM.
       return mime_type_lower_case == "video/webm";
     }
+
+    case DolbyVision:
+      // This function is only called on Android which doesn't support Dolby
+      // Vision.
+      return false;
   }
 
   return false;
@@ -618,6 +628,14 @@ bool MimeUtil::StringToCodec(const std::string& mime_type_lower_case,
   }
 #endif
 
+#if BUILDFLAG(ENABLE_DOLBY_VISION_DEMUXING)
+  if (ParseDolbyVisionCodecId(codec_id, out_profile, out_level)) {
+    *codec = MimeUtil::DolbyVision;
+    *is_ambiguous = false;
+    return true;
+  }
+#endif
+
   DVLOG(4) << __func__ << ": Unrecognized codec id " << codec_id;
   return false;
 }
@@ -647,6 +665,7 @@ bool MimeUtil::IsCodecProprietary(Codec codec) const {
     case MPEG4_AAC:
     case H264:
     case HEVC:
+    case DolbyVision:
       return true;
 
     case PCM: