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

ui/views/win/hwnd_message_handler_delegate.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_DELEGATE_H_
 #define UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_DELEGATE_H_
 
 #include "ui/views/views_export.h"
 
 namespace gfx {
@@ skipping 219 matching lines @@
                             WPARAM w_param,
                             LPARAM l_param,
                             LRESULT* result) = 0;
 
   // Like PreHandleMSG, but called after HWNDMessageHandler's built-in handling
   // has run and after DefWindowProc.
   virtual void PostHandleMSG(UINT message,
                              WPARAM w_param,
                              LPARAM l_param) = 0;
 
+  // Called when a mouse event is received. Returns true if the event was

[sky, 2014/01/10 16:43:21]

mouse->scroll

[ananta, 2014/01/10 18:59:21]

Done.

+  // handled by the delegate.
+  virtual bool HandleScrollEvent(const ui::ScrollEvent& event) = 0;
+
  protected:
   virtual ~HWNDMessageHandlerDelegate() {}
 };
 
 }  // namespace views
 
 #endif  // UI_VIEWS_WIN_HWND_MESSAGE_HANDLER_DELEGATE_H_