title: How to show an tray icon with a Google Packaged App or extension
body: <p>I'm trying to create a tray icon for my Chrome Packaged App (an icon in the system status bar). Like the Google Hangout extension do, I want the app to make something (open a menu) when the user click the icon.</p>
  
  <p>After some search, I've found this : <a href="https://docs.google.com/document/d/1QhhfR33Y28Yqnnoa_Sl3fnZK_mKtwt4dZe6kNyJ_MjU/edit" rel="nofollow">https://docs.google.com/document/d/1QhhfR33Y28Yqnnoa_Sl3fnZK_mKtwt4dZe6kNyJ_MjU/edit</a>
  It seems to be an old project from the chromium team of an experimental API that is doing what I'm searching. But it's not working for me. (Is it really for Packaged App ?)</p>
  
  <p>If it's can't be done for an Packaged App, it's not really a problem for me, I can switch to a Chrome Extension. But I can't find do for extension either.</p>
  
  <p>I think that if the Hangout extension can do this, I can do this too but I don't find anything on it.</p>
  
  <p>Thank you for your help !</p>