Implementing custom notification icons for the DisplayBalloon method on Windows.

chrome/browser/ui/views/status_icons/status_icon_win.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_VIEWS_STATUS_ICONS_STATUS_ICON_WIN_H_
 #define CHROME_BROWSER_UI_VIEWS_STATUS_ICONS_STATUS_ICON_WIN_H_
 #pragma once
 
 #include <windows.h>
 #include <shellapi.h>
@@ skipping 45 matching lines @@
 
   // Window used for processing messages from this icon.
   HWND window_;
 
   // The message identifier used for status icon messages.
   UINT message_id_;
 
   // The currently-displayed icon for the window.
   base::win::ScopedHICON icon_;
 
+  // The currently-displayed icon for the notification balloon.
+  base::win::ScopedHICON balloon_icon_;
+
 #if !defined(USE_AURA)
   // Context menu associated with this icon (if any).
   scoped_ptr<views::Menu2> context_menu_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(StatusIconWin);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_STATUS_ICONS_STATUS_ICON_WIN_H_