[Cleanup] Screen cleanup

ash/display/screen_ash.h

Index: ash/display/screen_ash.h
diff --git a/ash/screen_ash.h b/ash/display/screen_ash.h
similarity index 90%
copy from ash/screen_ash.h
copy to ash/display/screen_ash.h
index 6c076075e6ad13209b82a6e67968ff445118aeb6..970ec855432f2ecbdaa7003c5641a443b16adbd9 100644
--- a/ash/screen_ash.h
+++ b/ash/display/screen_ash.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_SCREEN_ASH_H_
-#define ASH_SCREEN_ASH_H_
+#ifndef ASH_DISPLAY_SCREEN_ASH_H_
+#define ASH_DISPLAY_SCREEN_ASH_H_
 
 #include "ash/ash_export.h"
 #include "base/compiler_specific.h"
@@ -15,6 +15,9 @@ class Rect;
 }
 
 namespace ash {
+namespace  internal {
+class DisplayManager;
+}
 
 // Aura implementation of gfx::Screen. Implemented here to avoid circular
 // dependencies.
@@ -56,12 +59,6 @@ class ASH_EXPORT ScreenAsh : public gfx::Screen {
   // invalid display if no such display is connected.
   static const gfx::Display& GetDisplayForId(int64 display_id);
 
-  // Notifies observers of display configuration changes.
-  void NotifyBoundsChanged(const gfx::Display& display);
-  void NotifyDisplayAdded(const gfx::Display& display);
-  void NotifyDisplayRemoved(const gfx::Display& display);
-
- protected:
   // gfx::Screen overrides:
   virtual bool IsDIPEnabled() OVERRIDE;
   virtual gfx::Point GetCursorScreenPoint() OVERRIDE;
@@ -81,6 +78,17 @@ class ASH_EXPORT ScreenAsh : public gfx::Screen {
   virtual void RemoveObserver(gfx::DisplayObserver* observer) OVERRIDE;
 
  private:
+  friend class internal::DisplayManager;
+
+  // Notifies observers of display configuration changes.
+  void NotifyBoundsChanged(const gfx::Display& display);
+  void NotifyDisplayAdded(const gfx::Display& display);
+  void NotifyDisplayRemoved(const gfx::Display& display);
+
+  // Creates a screen that can be used during shutdown.
+  // It simply has a copy of the displays.
+  gfx::Screen* CloneForShutdown();
+
   ObserverList<gfx::DisplayObserver> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(ScreenAsh);
@@ -88,4 +96,4 @@ class ASH_EXPORT ScreenAsh : public gfx::Screen {
 
 }  // namespace ash
 
-#endif  // ASH_SCREEN_ASH_H_
+#endif  // ASH_DISPLAY_SCREEN_ASH_H_