Shim Notification API in chrome to expose permissions

chromenotificationapi.js

function translateWebkitPermission(code) {
  switch (code) {
    case 0:
      return 'granted';
    case 1:
      return 'default';
    case 2:
      return 'denied';
  }
}
  
if (!Notification.permission) {
  Object.defineProperty(Notification, "permission", {
    get: function() { 
      return webkitNotifications && translateWebkitPermission(webkitNotifications.checkPermission()); 
    }
  });
}