Allow WebUI Tests to use preLoad in HtmlDialogUI.

chrome/test/data/webui/certificate_viewer_dialog_test.js

 // Copyright (c) 2011 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.
 
 /**
  * Test fixture for generated tests.
  * @extends {testing.Test}
  */
 function CertificateViewerUITest() {};
 
 CertificateViewerUITest.prototype = {
   __proto__: testing.Test.prototype,
 
   /**
    * Define the C++ fixture class and include it.
    * @type {?string}
    * @override
    */
   typedefCppFixture: 'CertificateViewerUITest',
+
+  /**
+   * Show the certificate viewer dialog.
+   */
+  testGenPreamble: function() {
+    GEN('ShowCertificateViewer();');
+  },
+
 };
 
 /**
  * Test fixture for asynchronous tests.
  * @extends {CertificateViewerUITest}
  */
 function CertificateViewerUITestAsync() {};
 
 CertificateViewerUITestAsync.prototype = {
   __proto__: CertificateViewerUITest.prototype,
@@ skipping 83 matching lines @@
 function getElementWithValue(tree) {
   for (var i = 0; i < tree.childNodes.length; i++) {
     var element = tree.childNodes[i];
     if (element.detail && element.detail.payload && element.detail.payload.val)
       return element;
     if (element = getElementWithValue(element))
       return element;
   }
   return null;
 }