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chromium/chrome/test/data/extensions/platform_apps/web_view/inside_iframe/main.js 

// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

var startTest = function() {
  var iframe = document.querySelector('iframe');
  var iframeWindow = iframe.contentWindow;
  iframe.addEventListener('load', function(e) {
    iframeWindow.document.querySelector('#webview-tag-container').innerHTML =
        '<webview></webview>';
    var webview = iframeWindow.document.querySelector('webview');
    webview.addEventListener('loadstop', function(e) {
      if (!webview.contentWindow) {
        chrome.test.sendMessage('WebViewTest.FAILURE');
        return;
      }
      chrome.test.sendMessage('WebViewTest.LAUNCHED');
    });
    webview.src = 'data:text/html,<body>Guest</body>';
  });
  iframe.src = 'webview.html';
};

window.onload = startTest;