Introduce Dolby Vision video codec and Demuxer support

media/formats/mp4/mp4_stream_parser.cc

Index: media/formats/mp4/mp4_stream_parser.cc
diff --git a/media/formats/mp4/mp4_stream_parser.cc b/media/formats/mp4/mp4_stream_parser.cc
index f8c96847059d02d3ef33af972a37d0e8d8807a0d..1f914bf42b2b63e6e16b877bad97f59d388e8ac3 100644
--- a/media/formats/mp4/mp4_stream_parser.cc
+++ b/media/formats/mp4/mp4_stream_parser.cc
@@ -644,7 +644,8 @@ bool MP4StreamParser::EnqueueSample(BufferQueueMap* buffers, bool* err) {
   std::vector<uint8_t> frame_buf(buf, buf + runs_->sample_size());
   if (video) {
     if (runs_->video_description().video_codec == kCodecH264 ||
-        runs_->video_description().video_codec == kCodecHEVC) {
+        runs_->video_description().video_codec == kCodecHEVC ||
+        runs_->video_description().video_codec == kCodecDolbyVision) {
       DCHECK(runs_->video_description().frame_bitstream_converter);
       if (!runs_->video_description().frame_bitstream_converter->ConvertFrame(
               &frame_buf, runs_->is_keyframe(), &subsamples)) {