Get horizontal wheel scrolling working again with logitech drivers.

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 <windows.h>
 
 #include <set>
@@ skipping 582 matching lines @@
   // touch input. This is fine because activation still works correctly via
   // native SetFocus calls invoked in the views code.
   bool touch_down_context_;
 
   // Time the last touch message was received. Used to flag mouse messages
   // synthesized by Windows for touch which are not flagged by the OS as
   // synthesized mouse messages. For more information please refer to
   // the IsMouseEventFromTouch function.
   static long last_touch_message_time_;
 
+  // Time the last WM_MOUSEHWHEEL message is received. Please refer to the
+  // HandleMouseEventInternal function as to why this is needed.
+  long last_mouse_hwheel_time_;
+
   DISALLOW_COPY_AND_ASSIGN(HWNDMessageHandler);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_H_