getBlob() {
    return {
      loadTimes: this.loadTimes_,
      averageLoadTime: this.getAverageLoadTime_(),
      started: this.started_,
      overlayAds: this.overlayAds_,
      playedCompletely: this.playedCompletely_,
      skipped: this.skipped_,
      errors: this.errors_,
    };
  }
Create a stats blob that we can pass up to the app. This blob will not
reference any internal data.

@return {shaka.extern.AdsStats}