The Tor Browser / file revision

 /* Any copyright is dedicated to the public domain.

    http://creativecommons.org/publicdomain/zero/1.0/ */

 // Bug 808231 - Add mozbrowsernextpaint event.

 "use strict";

 SimpleTest.waitForExplicitFinish();

 browserElementTestHelpers.setEnabledPref(true);

 browserElementTestHelpers.addPermission();

 function runTest() {

   var iframe = document.createElement('iframe');

   SpecialPowers.wrap(iframe).mozbrowser = true;

   document.body.appendChild(iframe);

   // Add a first listener that we'll remove shortly after.

   iframe.addNextPaintListener(wrongListener);

   var gotFirstNextPaintEvent = false;

   iframe.addNextPaintListener(function () {

     ok(!gotFirstNextPaintEvent, 'got the first nextpaint event');

     // Make sure we're only called once.

     gotFirstNextPaintEvent = true;

     iframe.addNextPaintListener(function () {

       info('got the second nextpaint event');

       SimpleTest.finish();

     });

     // Force the iframe to repaint.

     SimpleTest.executeSoon(function () iframe.src += '#next');

   });

   // Remove the first listener to make sure it's not called.

   iframe.removeNextPaintListener(wrongListener);

   iframe.src = 'file_browserElement_NextPaint.html';

 }

 function wrongListener() {

   ok(false, 'first listener should have been removed');

 }

 addEventListener('testready', runTest);