addDaiAdContainer_() {
    /** @private {!HTMLElement} */
    this.daiAdContainer_ = shaka.util.Dom.createHTMLElement('div');
    this.daiAdContainer_.classList.add('shaka-server-side-ad-container');
    this.controlsContainer_.appendChild(this.daiAdContainer_);
  }
Adds a container for server side ad UI with IMA SDK.

@private