Method _setActiveOption

src/cdk/listbox/listbox.ts:699–701

* Sets the given option as active. * @param option The option to make active

(option: CdkOption<T>)

   * @param option The option to make active
   */
  _setActiveOption(option: CdkOption<T>) {
    this.listKeyManager.setActiveItem(option);
  }

  /** Called when the listbox receives focus. */
  protected _handleFocus() {