[ash-md] Animates a window closed while in overview mode

ash/common/wm/overview/overview_animation_type.h

Index: ash/common/wm/overview/overview_animation_type.h
diff --git a/ash/common/wm/overview/overview_animation_type.h b/ash/common/wm/overview/overview_animation_type.h
index 66cd60c8051c6e771279d666a18ec26c4661002f..5db93566192ae92517a61d5fa8244ce9625bcb07 100644
--- a/ash/common/wm/overview/overview_animation_type.h
+++ b/ash/common/wm/overview/overview_animation_type.h
@@ -21,7 +21,13 @@ enum OverviewAnimationType {
   OVERVIEW_ANIMATION_HIDE_WINDOW,
   // Used to restore windows to their original position when exiting overview
   // mode.
-  OVERVIEW_ANIMATION_RESTORE_WINDOW
+  OVERVIEW_ANIMATION_RESTORE_WINDOW,
+  // Used to animate scaling down of a window that is about to get closed while
+  // overview mode is active.
+  OVERVIEW_ANIMATION_CLOSING_SELECTOR_ITEM,
+  // Used to animate hiding of a window that is closed while overview mode is
+  // active.
+  OVERVIEW_ANIMATION_CLOSE_SELECTOR_ITEM
 };
 
 }  // namespace ash