Ports SystemModalContainerLayoutManager to ash/common

ash/common/wm_window_property.h

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef ASH_COMMON_WM_WINDOW_PROPERTY_H_
 #define ASH_COMMON_WM_WINDOW_PROPERTY_H_
 
 namespace ash {
 
 enum class WmWindowProperty {
   // Type bool.
-  SNAP_CHILDREN_TO_PIXEL_BOUNDARY,
+  ALWAYS_ON_TOP,
 
-  // Type bool.
-  ALWAYS_ON_TOP,
+  // Type bool. See aura::client:kExcludeFromMruKey for details.
+  EXCLUDE_FROM_MRU,
+
+  // Type int, but cast to ui::ModalType.
+  MODAL_TYPE,
 
   // Type int.
   SHELF_ID,
 
   // Type ShelfItemDetails.
   SHELF_ITEM_DETAILS,
 
-  // Type int. See aura::client::kTopViewInset for details.
-  TOP_VIEW_INSET,
+  // Type bool.
+  SNAP_CHILDREN_TO_PIXEL_BOUNDARY,
 
   // Type SkColor. See aura::client::kTopViewColor for details.
   TOP_VIEW_COLOR,
 
-  // Type bool. See aura::client:kExcludeFromMruKey for details.
-  EXCLUDE_FROM_MRU,
+  // Type int. See aura::client::kTopViewInset for details.
+  TOP_VIEW_INSET,
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_WINDOW_PROPERTY_H_