setFullTypeForStream_(stream) {
    const combinations = new Set([shaka.util.MimeUtils.getFullType(
        stream.mimeType, stream.codecs)]);
    if (stream.segmentIndex) {
      stream.segmentIndex.forEachTopLevelReference((reference) => {
        if (reference.mimeType) {
          combinations.add(shaka.util.MimeUtils.getFullType(
              reference.mimeType, stream.codecs));
        }
      });
    }
    stream.fullMimeTypes = combinations;
  }
@param {!shaka.extern.Stream} stream
@private