Provide ability for WebUIBrowserTests to run asynchronous tests.

chrome/browser/ui/webui/web_ui_browsertest.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_WEB_UI_BROWSERTEST_H_
 #define CHROME_BROWSER_UI_WEBUI_WEB_UI_BROWSERTEST_H_
 #pragma once
 
 #include <string>
 
@@ skipping 77 matching lines @@
                      const std::string& preload_test_name);
 
   // Called by javascript-generated test bodies to browse to a page and preload
   // the javascript for the given |preload_test_fixture| and
   // |preload_test_name|. chrome.send will be overridden to allow javascript
   // handler mocking.
   void BrowsePrintPreload(const GURL& browse_to,
                           const std::string& preload_test_fixture,
                           const std::string& preload_test_name);
 
+  // Runs a message loop until async test finishes.  Returns the result of the
+  // test.
+  bool WaitForAsyncResult();
+
  protected:
   WebUIBrowserTest();
 
   // Setup test path.
   virtual void SetUpInProcessBrowserTestFixture();
 
   // Returns a mock WebUI object under test (if any).
   virtual WebUIMessageHandler* GetMockMessageHandler();
 
   // Returns a file:// GURL constructed from |path| inside the test data dir for
@@ skipping 40 matching lines @@
   // again.
   bool libraries_preloaded_;
 
   // Saves the states of |test_fixture| and |test_name| for calling
   // PreloadJavascriptLibraries().
   std::string preload_test_fixture_;
   std::string preload_test_name_;
 };
 
 #endif  // CHROME_BROWSER_UI_WEBUI_WEB_UI_BROWSERTEST_H_