Support multi touch on Windows 8 AURA and ASH.

ui/aura/remote_root_window_host_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_AURA_REMOTE_ROOT_WINDOW_HOST_WIN_H_
 #define UI_AURA_REMOTE_ROOT_WINDOW_HOST_WIN_H_
 
 #include <vector>
 
 #include "base/callback.h"
@@ skipping 109 matching lines @@
                  uint32 flags);
   void OnKeyUp(uint32 vkey,
                uint32 repeat_count,
                uint32 scan_code,
                uint32 flags);
   void OnChar(uint32 key_code,
               uint32 repeat_count,
               uint32 scan_code,
               uint32 flags);
   void OnVisibilityChanged(bool visible);
-  void OnTouchDown(int32 x, int32 y, uint64 timestamp);
-  void OnTouchUp(int32 x, int32 y, uint64 timestamp);
-  void OnTouchMoved(int32 x, int32 y, uint64 timestamp);
+  void OnTouchDown(int32 x, int32 y, uint64 timestamp, uint32 pointer_id);
+  void OnTouchUp(int32 x, int32 y, uint64 timestamp, uint32 pointer_id);
+  void OnTouchMoved(int32 x, int32 y, uint64 timestamp, uint32 pointer_id);
   void OnFileSaveAsDone(bool success,
                         string16 filename,
                         int filter_index);
   void OnFileOpenDone(bool success, string16 filename);
   void OnMultiFileOpenDone(bool success,
                            const std::vector<base::FilePath>& files);
 
   // RootWindowHost overrides:
   virtual void SetDelegate(RootWindowHostDelegate* delegate) OVERRIDE;
   virtual RootWindow* GetRootWindow() OVERRIDE;
@@ skipping 46 matching lines @@
   OpenFileCompletion file_open_completion_callback_;
   OpenMultipleFilesCompletion multi_file_open_completion_callback_;
   SaveFileCompletion file_saveas_completion_callback_;
 
   DISALLOW_COPY_AND_ASSIGN(RemoteRootWindowHostWin);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_REMOTE_ROOT_WINDOW_HOST_WIN_H_