Refactor backdrop

ui/aura/client/aura_constants.h

 // Copyright (c) 2012 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 UI_AURA_CLIENT_AURA_CONSTANTS_H_
 #define UI_AURA_CLIENT_AURA_CONSTANTS_H_
 
 #include <string>
 
 #include "base/strings/string16.h"
@@ skipping 97 matching lines @@
 AURA_EXPORT extern const WindowProperty<int32_t>* const kResizeBehaviorKey;
 
 // A property key to store the restore bounds for a window.
 AURA_EXPORT extern const WindowProperty<gfx::Rect*>* const kRestoreBoundsKey;
 
 // A property key to store ui::WindowShowState for a window.
 // See ui/base/ui_base_types.h for its definition.
 AURA_EXPORT extern const WindowProperty<ui::WindowShowState>* const
     kShowStateKey;
 
+// A bool property key to specify if the window should have a backdrop.

[sky, 2017/05/15 17:38:28]

'Backdrop' isn't a readily obvious term. Please document what a backdrop means.
Also, keep sorted.

[oshima, 2017/05/16 08:22:10]

Done.

+AURA_EXPORT extern const WindowProperty<bool>* const kHasBackdrop;
+
 // A property key to store the title of the window; sometimes shown to users.
 AURA_EXPORT extern const WindowProperty<base::string16*>* const kTitleKey;
 
 // The inset of the topmost view in the client view from the top of the
 // non-client view. The topmost view depends on the window type. The topmost
 // view is the tab strip for tabbed browser windows, the toolbar for popups,
 // the web contents for app windows and varies for fullscreen windows.
 AURA_EXPORT extern const WindowProperty<int>* const kTopViewInset;
 
 // The color of the window header.
 AURA_EXPORT extern const WindowProperty<SkColor>* const kTopViewColor;
 
 // A property key to store the window icon, typically 16x16 for title bars.
 AURA_EXPORT extern const WindowProperty<gfx::ImageSkia*>* const kWindowIconKey;
 
 // Indicates the type of embedding within the given window.
 AURA_EXPORT extern const WindowProperty<WindowEmbedType>* const kEmbedType;
 
 AURA_EXPORT extern const WindowProperty<ui::mojom::WindowType>* const
     kWindowTypeKey;
 
 // Alphabetical sort.
 
 }  // namespace client
 }  // namespace aura
 
 #endif  // UI_AURA_CLIENT_AURA_CONSTANTS_H_