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..53130734ddd55a61b3a3c176e3e99c62de2f8264 100644
--- a/ash/display/display_controller.h
+++ b/ash/display/display_controller.h
@@ -191,6 +191,16 @@ 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;
+
+  // Update the current cursor image that is sutable for the given
+  // |point_in_native|.
+  void UpdateMouseCursor(const gfx::Point& point_in_native);
+
   // aura::DisplayObserver overrides:
   virtual void OnDisplayBoundsChanged(
       const gfx::Display& display) OVERRIDE;
@@ -223,6 +233,8 @@ class ASH_EXPORT DisplayController : public gfx::DisplayObserver {
 
   void OnFadeOutForSwapDisplayFinished();
 
+  bool in_bootstrap() const { return in_bootstrap_; }
+
   class DisplayChangeLimiter {
    public:
     DisplayChangeLimiter();
@@ -258,6 +270,8 @@ class ASH_EXPORT DisplayController : public gfx::DisplayObserver {
   // display.
   aura::RootWindow* primary_root_window_for_replace_;
 
+  bool in_bootstrap_;
+
   DISALLOW_COPY_AND_ASSIGN(DisplayController);
 };