Desktop chrome tab capture-chooseDesktopMedia()

chrome/common/extensions/docs/examples/api/desktopCapture/app.js

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 'use strict';
 
-const DESKTOP_MEDIA = ['screen', 'window'];
+const DESKTOP_MEDIA = ['screen', 'window', "tab"];
 
 var pending_request_id = null;
 var pc1 = null;
 var pc2 = null;
 
 // Launch the chooseDesktopMedia().
 document.querySelector('#start').addEventListener('click', function(event) {
   pending_request_id = chrome.desktopCapture.chooseDesktopMedia(
       DESKTOP_MEDIA, onAccessApproved);
 });
@@ skipping 95 matching lines @@
     var remotePC = (pc === pc1) ? pc2 : pc1;
     remotePC.addIceCandidate(new RTCIceCandidate(event.candidate));
   }
 }
 
 function onIceStateChange(pc, event) {
   if (pc) {
     console.log('ICE state change event: ', event);
   }
 }