title: How to set a promotional image in the Chrome Extensions list?
body: <p>I can see that a lot of Chrome Extensions have a promotional image in the list. For example with gmail :
  <a href="https://chrome.google.com/webstore/search-extensions/gmail?hl=fr&amp;utm_source=chrome-ntp-launcher" rel="nofollow">https://chrome.google.com/webstore/search-extensions/gmail?hl=fr&amp;utm_source=chrome-ntp-launcher</a></p>
  
  <p>I don't find where to set this image in the Developer Dashboard. How to ?</p>