onManifestUpdated(isLive) {
    this.isLive_ = isLive;
    if (this.trackingUrl_ != '') {
      this.requestTrackingInfo_(
          this.trackingUrl_, this.firstTrackingRequest_);
      this.firstTrackingRequest_ = false;
    }
  }
Fired when the manifest is updated

@param {boolean} isLive