Moving the mouse-wheel processing code out of the FocusManager

chrome/views/focus/focus_util_win.h

 // Copyright (c) 2009 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_VIEWS_FOCUS_FOCUS_UTIL_WIN_H_
 #define CHROME_VIEWS_FOCUS_FOCUS_UTIL_WIN_H_
 
+#include <windows.h>
+
 namespace views {
 
 // Marks the passed |hwnd| as supporting mouse-wheel message rerouting.
 // We reroute the mouse wheel messages to such HWND when they are under the
 // mouse pointer (but are not the active window)
 void SetWindowSupportsRerouteMouseWheel(HWND hwnd);
 
 // Forwards mouse wheel messages to the window under it.
 // Windows sends mouse wheel messages to the currently active window.
 // This causes a window to scroll even if it is not currently under the mouse
 // wheel. The following code gives mouse wheel messages to the window under the
 // mouse wheel in order to scroll that window. This is arguably a better user
 // experience.  The returns value says whether the mouse wheel message was
 // successfully redirected.
 bool RerouteMouseWheel(HWND window, WPARAM w_param, LPARAM l_param);
 
 }   // namespace views
 
 #endif  // CHROME_VIEWS_FOCUS_FOCUS_UTIL_WIN_H_