问chrome.notification.create在OS X上不显示通知

EN

{
  "name": "Test",
  "description": "Test",
  "manifest_version": 2,
  "version": "0.1",
  "chrome_url_overrides" : {
    "newtab": "register.html"
  },
  "background": {
    "scripts": ["background.js"]
  },
  "permissions": ["idle", "tabs", "gcm", "storage", "notifications"],
  "icons": { "128": "gcm_128.png" }
}

  function messageReceived(message) {
    var messageString = '';
    if(message) messageString = message;
    var nid = getNotificationId();
    messageString = messageString + nid;

    // Pop up a notification to show the GCM message.
    chrome.notifications.create(nid, {
      title: 'Kukdu Kuuu',
      iconUrl: 'gcm_128.png',
      type: 'basic',
      message: messageString
    }, function() {});
  }

  // Returns a new notification ID used in the notification.
  function getNotificationId() {
    var id = Math.floor(Math.random() * 9007199254740992) + 1;
    return id.toString();
  }

  setInterval(function() {
    console.log('running - ');
    messageReceived('test notification ');
  }, 20000);