onTrackSelected_(track) {
    // Disable abr manager before changing tracks.
    const config = {abr: {enabled: false}};
    this.player.configure(config);
    const clearBuffer = this.controls.getConfig().clearBufferOnQualityChange;
    this.player.selectVariantTrack(track, clearBuffer);
  }
@param {!shaka.extern.Track} track
@private