Implement WM_MOUSEHWHEEL events....

chrome/browser/render_widget_host_view_win.h

 // Copyright (c) 2006-2008 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_RENDER_WIDGET_HOST_VIEW_WIN_H_
 #define CHROME_BROWSER_RENDER_WIDGET_HOST_VIEW_WIN_H_
 
 #include <atlbase.h>
 #include <atlapp.h>
 #include <atlcrack.h>
@@ skipping 91 matching lines @@
     MESSAGE_HANDLER(WM_MBUTTONUP, OnMouseEvent)
     MESSAGE_HANDLER(WM_RBUTTONUP, OnMouseEvent)
     MESSAGE_HANDLER(WM_LBUTTONDBLCLK, OnMouseEvent)
     MESSAGE_HANDLER(WM_MBUTTONDBLCLK, OnMouseEvent)
     MESSAGE_HANDLER(WM_RBUTTONDBLCLK, OnMouseEvent)
     MESSAGE_HANDLER(WM_SYSKEYDOWN, OnKeyEvent)
     MESSAGE_HANDLER(WM_SYSKEYUP, OnKeyEvent)
     MESSAGE_HANDLER(WM_KEYDOWN, OnKeyEvent)
     MESSAGE_HANDLER(WM_KEYUP, OnKeyEvent)
     MESSAGE_HANDLER(WM_MOUSEWHEEL, OnWheelEvent)
+    MESSAGE_HANDLER(WM_MOUSEHWHEEL, OnWheelEvent)
     MESSAGE_HANDLER(WM_HSCROLL, OnWheelEvent)
     MESSAGE_HANDLER(WM_VSCROLL, OnWheelEvent)
     MESSAGE_HANDLER(WM_CHAR, OnKeyEvent)
     MESSAGE_HANDLER(WM_SYSCHAR, OnKeyEvent)
     MESSAGE_HANDLER(WM_IME_CHAR, OnKeyEvent)
     MESSAGE_HANDLER(WM_MOUSEACTIVATE, OnMouseActivate)
     MESSAGE_HANDLER(WM_GETOBJECT, OnGetObject)
   END_MSG_MAP()
 
   // Implementation of RenderWidgetHostView:
@@ skipping 148 matching lines @@
   // Whether the renderer is made accessible.
   // TODO(jcampan): http://b/issue?id=1432077 This is a temporary work-around
   // until that bug is fixed.
   bool renderer_accessible_;
 
   DISALLOW_EVIL_CONSTRUCTORS(RenderWidgetHostViewWin);
 };
 
 #endif  // #ifndef CHROME_BROWSER_RENDER_WIDGET_HOST_VIEW_WIN_H_