Inject CanAddURLToHistory into TopSitesImpl

chrome/test/data/extensions/api_test/window_open/panel/test.js

 // Copyright (c) 2012 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 panelWindowId = 0;
+var panelLoaded = false;
 
 // This function is called by the panel during the test run.
 function panelCallback() {
+  panelLoaded = true;
+  maybeReadyForTest();
+}
+
+function maybeReadyForTest() {
+  // The order of the two callbacks is not guaranteed.
+  if( panelWindowId === 0 || !panelLoaded)
+    return;
+
   // We have now added a panel so the total counts is 2 (browser + panel).
   chrome.test.assertEq(2, chrome.extension.getViews().length);
   // Verify that we're able to get the view of the panel by its window id.
   chrome.test.assertEq(1,
       chrome.extension.getViews({"windowId": panelWindowId}).length);
   chrome.test.notifyPass();
 }
 
 chrome.test.runTests([
   function openPanel() {
     chrome.test.listenOnce(chrome.windows.onCreated, function(window) {
       chrome.test.assertTrue(window.width > 0);
       chrome.test.assertTrue(window.height > 0);
       chrome.test.assertEq("panel", window.type);
       chrome.test.assertTrue(!window.incognito);
     });
     chrome.windows.create(
         { 'url': chrome.extension.getURL('panel.html'), 'type': 'panel' },
         function(win) {
             chrome.test.assertEq('panel', win.type);
             chrome.test.assertEq(true, win.alwaysOnTop);
             panelWindowId = win.id;
             // The panel will call back to us through panelCallback (above).
+            maybeReadyForTest();
         });
   }
 ]);