Revert of Moving coordinate conversion methods from ash/wm to ui/wm.

ash/wm/coordinate_conversion.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 ASH_WM_COORDINATE_CONVERSION_H_
 #define ASH_WM_COORDINATE_CONVERSION_H_
 
 #include "ash/ash_export.h"
 
 namespace aura {
@@ skipping 10 matching lines @@
 
 // Returns the RootWindow at |point| in the virtual screen coordinates.
 // Returns NULL if the root window does not exist at the given
 // point.
 ASH_EXPORT aura::Window* GetRootWindowAt(const gfx::Point& point);
 
 // Returns the RootWindow that shares the most area with |rect| in
 // the virtual scren coordinates.
 ASH_EXPORT aura::Window* GetRootWindowMatching(const gfx::Rect& rect);
 
+// Converts the |point| from a given |window|'s coordinates into the screen
+// coordinates.
+ASH_EXPORT void ConvertPointToScreen(const aura::Window* window,
+                                     gfx::Point* point);
+
+// Converts the |point| from the screen coordinates to a given |window|'s
+// coordinates.
+ASH_EXPORT void ConvertPointFromScreen(const aura::Window* window,
+                                       gfx::Point* point_in_screen);
+
 }  // namespace wm
 }  // namespace ash
 
 #endif  // ASH_WM_COORDINATE_CONVERSION_H_