Function getObserver

src/utils/display-observer.js:404–407

* @param {!Element} target * @return {!DisplayObserver}

(target)

 * @return {!DisplayObserver}
 */
function getObserver(target) {
  registerServiceBuilderForDoc(target, SERVICE_ID, DisplayObserver);
  return /** @type {!DisplayObserver} */ (getServiceForDoc(target, SERVICE_ID));
}

/**
 * @param {?Array<boolean>} observations