markAsFeatured(shortName) {
    this.isFeatured = true;
    this.shortName = shortName || this.shortName;
    return this;
  }
If this is called, the asset will appear on the main page of the demo.
Also, this allows you to provide a shorter name to be used in the feature
card.
@param {string=} shortName
@return {!ShakaDemoAssetInfo}