Get mouse events to work with win aura, and make the combobox function in the views examples app.

ui/views/win/hwnd_message_handler.h

 // Copyright (c) 2012 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 UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_
 #define UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_
 
 #include <atlbase.h>
 #include <atlapp.h>
 #include <atlmisc.h>
@@ skipping 211 matching lines @@
   // Synchronously paints the invalid contents of the Widget.
   void RedrawInvalidRect();
 
   // Synchronously updates the invalid contents of the Widget. Valid for
   // layered windows only.
   void RedrawLayeredWindowContents();
 
 
   // Message Handlers ----------------------------------------------------------
 
-  BEGIN_MSG_MAP_EX(NativeWidgetWin)
+  BEGIN_MSG_MAP_EX(HWNDMessageHandler)
     // Range handlers must go first!
     MESSAGE_RANGE_HANDLER_EX(WM_MOUSEFIRST, WM_MOUSELAST, OnMouseRange)
     MESSAGE_RANGE_HANDLER_EX(WM_NCMOUSEMOVE, WM_NCXBUTTONDBLCLK, OnMouseRange)
 
     // Reflected message handler
     MESSAGE_HANDLER_EX(base::win::kReflectedMessage, OnReflectedMessage)
 
     // CustomFrameWindow hacks
     MESSAGE_HANDLER_EX(WM_NCUAHDRAWCAPTION, OnNCUAHDrawCaption)
     MESSAGE_HANDLER_EX(WM_NCUAHDRAWFRAME, OnNCUAHDrawFrame)
@@ skipping 214 matching lines @@
   // True if we are allowed to update the layered window from the DIB backing
   // store if necessary.
   bool can_update_layered_window_;
 
   DISALLOW_COPY_AND_ASSIGN(HWNDMessageHandler);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_