Aura: Add Window::MoveCursorTo() taking relative location to the window.

ui/aura/window.h

Index: ui/aura/window.h
diff --git a/ui/aura/window.h b/ui/aura/window.h
index a516730abf5545fe7ab78ef3813ddb8234636a5a..34a5702b4c6c9a5d7c1bc555a0ec69a5971554c1 100644
--- a/ui/aura/window.h
+++ b/ui/aura/window.h
@@ -213,6 +213,9 @@ class AURA_EXPORT Window : public ui::LayerDelegate,
                                    const Window* target,
                                    gfx::Point* point);
 
+  // Moves the cursor to the specified location relative to the window.
+  virtual void MoveCursorTo(const gfx::Point& point_in_window);
+
   // Returns the cursor for the specified point, in window coordinates.
   gfx::NativeCursor GetCursor(const gfx::Point& point) const;