ash: Restore previous show state after exiting fullscreen.

ash/common/wm_window.h

Index: ash/common/wm_window.h
diff --git a/ash/common/wm_window.h b/ash/common/wm_window.h
index b8aef305f1b6c6f1f538747118b84344ae94339e..c855661f902b67cd19c6e587a1ee52847684bdd6 100644
--- a/ash/common/wm_window.h
+++ b/ash/common/wm_window.h
@@ -264,7 +264,9 @@ class ASH_EXPORT WmWindow : public aura::WindowObserver,
   void SetShowState(ui::WindowShowState show_state);
   ui::WindowShowState GetShowState() const;
 
-  void SetRestoreShowState(ui::WindowShowState show_state);
+  void SetPreMinimizedShowState(ui::WindowShowState show_state);
+  ui::WindowShowState GetPreMinimizedShowState() const;
+  void SetPreFullscreenShowState(ui::WindowShowState show_state);
 
   // Sets the restore bounds and show state overrides. These values take
   // precedence over the restore bounds and restore show state (if set).
@@ -317,7 +319,7 @@ class ASH_EXPORT WmWindow : public aura::WindowObserver,
   void Activate();
   void Deactivate();
 
-  void SetFullscreen();
+  void SetFullscreen(bool fullscreen);
 
   void Maximize();
   void Minimize();