Allow WebUI Tests to use preLoad in HtmlDialogUI.

chrome/common/chrome_notification_types.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_COMMON_CHROME_NOTIFICATION_TYPES_H_
 #define CHROME_COMMON_CHROME_NOTIFICATION_TYPES_H_
 #pragma once
 
 #include "content/public/browser/notification_types.h"
 
@@ skipping 53 matching lines @@
   NOTIFICATION_TAB_SNAPSHOT_TAKEN,
 
   // The user has changed the browser theme. The source is a
   // Source<ThemeService>. There are no details.
   NOTIFICATION_BROWSER_THEME_CHANGED,
 
   // Sent when the renderer returns focus to the browser, as part of focus
   // traversal. The source is the browser, there are no details.
   NOTIFICATION_FOCUS_RETURNED_TO_BROWSER,
 
-  // Sent after an HtmlDialog dialog has been shown. The source is the dialog.
+  // Sent after an HtmlDialog dialog has been shown. The source is the
+  // dialog. The details is a Details<RenderViewHost> with a pointer to the RVH
+  // for the shown dialog.
   NOTIFICATION_HTML_DIALOG_SHOWN,
 
   // Application-modal dialogs -----------------------------------------------
 
   // Sent after an application-modal dialog has been shown. The source
   // is the dialog.
   NOTIFICATION_APP_MODAL_DIALOG_SHOWN,
 
   // This message is sent when a new InfoBar has been added to a
   // InfoBarTabHelper.  The source is a Source<InfoBarTabHelper> with a
@@ skipping 887 matching lines @@
   // Currently only Content and Chrome define and use notifications.
   // Custom notifications not belonging to Content and Chrome should start
   // from here.
   NOTIFICATION_CHROME_END,
 };
 
 }  // namespace chrome
 
 
 #endif  // CHROME_COMMON_CHROME_NOTIFICATION_TYPES_H_