Method animate_

third_party/subscriptions-project/swg.js:11249–11263

* @param {function():!Promise} callback * @return {!Promise} * @private

(callback)

   * @private
   */
  animate_(callback) {
    const wait = this.animating_ || Promise.resolve();
    return (this.animating_ = wait
      .then(
        () => {
          return callback();
        },
        () => {
          // Ignore errors to make sure animations don't get stuck.
        }
      )
      .then(() => {
        this.animating_ = null;
      }));
  }

  /**
   * Returns maximum allowed height for current viewport.