Allow WebUI Tests to use preLoad in HtmlDialogUI.

chrome/test/data/webui/test_api.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.
 
 /**
  * @fileoverview Library providing basic test framework functionality.
  */
 
 /**
  * Namespace for |Test|.
@@ skipping 51 matching lines @@
      * When set to a string value representing an html page in the test
      * directory, generate BrowsePrintPreload call, which will browse to a url
      * representing the file, cause print, and call fixture.preLoad of the
      * currentTestCase.
      * @type {string}
      */
     browsePrintPreload: null,
 
     /**
      * When set to a function, will be called in the context of the test
-     * generation inside the function, and before any generated C++.
+     * generation inside the function, after AddLibrary calls and before
+     * generated C++.
      * @type {function(string,string)}
      */
     testGenPreamble: null,
 
     /**
      * When set to a function, will be called in the context of the test
      * generation inside the function, and after any generated C++.
      * @type {function(string,string)}
      */
     testGenPostamble: null,
@@ skipping 1315 matching lines @@
   exports.DUMMY_URL = DUMMY_URL;
   exports.TEST = TEST;
   exports.TEST_F = TEST_F;
   exports.GEN = GEN;
   exports.GEN_INCLUDE = GEN_INCLUDE;
   exports.WhenTestDone = WhenTestDone;
 
   // Import the Mock4JS helpers.
   Mock4JS.addMockSupport(exports);
 })(this);