Ensure that trackpad and trackpoint scrolling works on Windows desktop Aura with legacy trackpad dr…

ui/views/widget/native_widget_win.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_WIDGET_NATIVE_WIDGET_WIN_H_
 #define UI_VIEWS_WIDGET_NATIVE_WIDGET_WIN_H_
 
 #include <vector>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 218 matching lines @@
                                       WPARAM w_param,
                                       LPARAM l_param) OVERRIDE;
   virtual void HandleMenuLoop(bool in_menu_loop) OVERRIDE;
   virtual bool PreHandleMSG(UINT message,
                             WPARAM w_param,
                             LPARAM l_param,
                             LRESULT* result) OVERRIDE;
   virtual void PostHandleMSG(UINT message,
                              WPARAM w_param,
                              LPARAM l_param) OVERRIDE;
+  virtual bool HandleScrollEvent(const ui::ScrollEvent& event) OVERRIDE;
 
   // The TooltipManager. This is NULL if there is a problem creating the
   // underlying tooltip window.
   // WARNING: RootView's destructor calls into the TooltipManager. As such, this
   // must be destroyed AFTER root_view_.
   scoped_ptr<TooltipManagerWin> tooltip_manager_;
 
   scoped_refptr<DropTargetWin> drop_target_;
 
  private:
@@ skipping 20 matching lines @@
   bool has_non_client_view_;
 
   scoped_ptr<HWNDMessageHandler> message_handler_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeWidgetWin);
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIDGET_NATIVE_WIDGET_WIN_H_