title: Firebase Cloud Messaging requireInteraction not work
body: <p>Reference: <a href="https://github.com/firebase/quickstart-js/tree/master/messaging" rel="nofollow noreferrer">https://github.com/firebase/quickstart-js/tree/master/messaging</a></p>
  
  <p>I have added the key-value pair:</p>
  
  <pre><code>"requireInteraction": true
  </code></pre>
  
  <p>But the notification in Desktop Chrome still disappear after 20 seconds. Does any one know if Firebase supports this key-value pair? Thanks!</p>
  
  <p>My example below. Please change <code>[...]</code> to yours.</p>
  
  <pre><code>curl -X POST -H "Authorization: key=[...]" -H "Content-Type: application/json" -d '{
    "notification": {
      "requireInteraction": true,     
      "title": "This is custom title",
      "body": "this is custom body",
      "click_action": "https://google.com",
      "data" : {"requireInteraction": true  }
   },
    "to": "[...]",
  }' "https://fcm.googleapis.com/fcm/send"
  </code></pre>