title: show notifications in chrome extension
body: <p>I'm writing my first chrome extension. In my chrome extension I have added an option in Right Click Context menu.</p>
  
  <pre class="lang-js prettyprint-override"><code>chrome.contextMenus.create({
    "id": "MyExntesion",
    "title": "My Extension",
    "type": "normal",
    "contexts": ["image"],
    "onclick": this.handleClick
  });
  </code></pre>
  
  <p>In my handleClick method, I want to show a notification. This notification should pop out in top right corner of the browser window which just confirms that user has clicked on the context menu. How do I do that?</p>
  
  <p>I did some research but didn't find anything useful. <a href="https://developer.chrome.com/extensions/notifications" rel="nofollow noreferrer">https://developer.chrome.com/extensions/notifications</a> this talkes about system tray notification, where as this <a href="https://developer.chrome.com/extensions/browserAction#method-setPopup" rel="nofollow noreferrer">https://developer.chrome.com/extensions/browserAction#method-setPopup</a> lets you create new popups but they are only shown when extension icon is clicked.</p>