Set HDR color info on FrameworkMuxer

Not setting the color info results in a missing "colr" box in the produced
container, under file/moov/trak/mdia/minf/stbl/stsd/hvc1. This means extractors
will not be able to find out the transcoded file is HDR.

In `Transformer`, this means it can't transcode this transcoded file, because
it currently relies on the container bearing HDR info to construct the
transcoding sample pipeline.

PiperOrigin-RevId: 487276712

library/transformer/src/main/java/com/google/android/exoplayer2/transformer/FrameworkMuxer.java

@@ -124,6 +124,7 @@ public int addTrack(Format format) throws MuxerException {
     } else {
       mediaFormat =
           MediaFormat.createVideoFormat(castNonNull(sampleMimeType), format.width, format.height);
+      MediaFormatUtil.maybeSetColorInfo(mediaFormat, format.colorInfo);
       try {
         mediaMuxer.setOrientationHint(format.rotationDegrees);
       } catch (RuntimeException e) {