Notificação do Chrome

var notification = webkitNotifications.createNotification(
                'icon.png',
                'title',
                'text"
);
notification.show();
   //cancel it after 5 seconds.
setTimeout(function(){
    notification.cancel();
},5000);

Em manifest.json:

"permissions": [
    "notifications"
 ],
"web_accessible_resources": [
   "icon.png"
 ]