Don't allow main world initialization while creating the initial empty document

chrome/test/data/extensions/api_test/bindings/chromei18nrepro/background.js

+// Copyright 2015 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.
+
+var windowLoaded = false;
+var messaged = false;
+var iframeI18n = undefined;
+var appWindow = undefined;
+
+chrome.app.runtime.onLaunched.addListener(function() {
+  chrome.app.window.create('window.html', {
+    id: "mainwin",
+    innerBounds: {
+      width: 700,
+      height: 600
+    }
+  }, function(win) {
+    appWindow = win;
+    appWindow.contentWindow.onload = function() {
+      windowLoaded = true;
+      chrome.test.log('Window loaded: ' + windowLoaded);
+      chrome.test.log('Iframe i18n: ' + iframeI18n);
+      // If the message already arrived, report the i18n state.
+      if (messaged) {
+        appWindow.contentWindow.reportChromeI18nState(
+            chrome.i18n != undefined, iframeI18n);
+      }
+    };
+  });
+});
+
+function initialize() {
+  var iframe = document.createElement('iframe');
+  iframe.src = '/iframe.html';
+  iframe.style.display = 'none';
+
+  document.body.appendChild(iframe);
+
+  window.addEventListener('message', function(e) {
+    messaged = true;
+    iframeI18n = e.data;
+    if (windowLoaded) {
+      appWindow.contentWindow.reportChromeI18nState(
+          chrome.i18n != undefined, iframeI18n);
+    }
+  });
+};
+
+initialize();