Chrome发件人：media.playerState未正确更新

Question

我正在使用Chrome Sender应用程序，并注意到在成功执行播放请求时media.playerState未正确更新为chrome.cast.media.PlayerState.PLAYING。我知道可以通过media.addUpdateListener(onMediaUpdate);订阅媒体状态更新，但这不太方便。有没有计划让API更加一致？

/**
 * @param {chrome.cast.media.Media} media
 * @return {Promise.defer}
 */
function playMedia(media) {
  let playDefer = Promise.defer();
  let playRequest = new chrome.cast.media.PlayRequest();

  media.play(playRequest, onPlaySuccess.bind(null, playDefer, media), onPlayError); 

  return playDefer;
}

/**
 * @param {Promise.defer} defer
 * @param {chrome.cast.media.Media} media
 */
function onPlaySuccess(defer, media) {
  // Actually `media.playerState` is still chrome.cast.media.PlayerState.PAUSED
  // Is it expected behaviour? 
  console.log('play request success', media.playerState === chrome.cast.media.PlayerState.PLAYING);
  defer.resolve(media);
}

/**
 * @param {chrome.cast.Error} error
 */
function onPlayError(error) {
  console.log(error.code, error.description);
}