Don't move cursor location when rotation /ui scaling has changed

ash/display/display_controller.h

Index: ash/display/display_controller.h
diff --git a/ash/display/display_controller.h b/ash/display/display_controller.h
index 9fccbffa37deca4363f16cabfcc84b73e99d7048..906dab2639d68bbc862fed7d6277f46638206e60 100644
--- a/ash/display/display_controller.h
+++ b/ash/display/display_controller.h
@@ -191,6 +191,13 @@ class ASH_EXPORT DisplayController : public gfx::DisplayObserver {
   // Returns the display layout registered for the given display id |pair|.
   DisplayLayout GetRegisteredDisplayLayout(const DisplayIdPair& pair) const;
 
+  // Checks if the mouse pointer is on one of displays, and moves to
+  // the center of the nearest display if it's outside of all displays.
+  void EnsurePointerInDisplays();
+
+  gfx::Point GetNativeMouseCursorLocation() const;
+  void UpdateMouseCursor(const gfx::Point& point_in_native);
+
   // aura::DisplayObserver overrides:
   virtual void OnDisplayBoundsChanged(
       const gfx::Display& display) OVERRIDE;