mash: Fix shelf window property use in Chrome.

ash/wm/window_properties.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 ASH_WM_WINDOW_PROPERTIES_H_
 #define ASH_WM_WINDOW_PROPERTIES_H_
 
 #include "ash/ash_export.h"
+#include "ash/common/shelf/shelf_item_types.h"
 #include "ui/base/ui_base_types.h"
 #include "ui/gfx/geometry/rect.h"
 
 namespace aura {
 class Window;
 
 template <typename T>
 struct WindowProperty;
 }
 
@@ skipping 16 matching lines @@
 // maximized mode window manager.
 ASH_EXPORT extern const aura::WindowProperty<gfx::Rect*>* const
     kRestoreBoundsOverrideKey;
 
 // A property key which stores the bounds to restore a window to. These take
 // preference over the current bounds/state if |kRestoreBoundsOverrideKey| is
 // set. This is used by e.g. the always maximized mode window manager.
 ASH_EXPORT extern const aura::WindowProperty<ui::WindowShowState>* const
     kRestoreShowStateOverrideKey;
 
+// A property key to store the icon resource id for a window's shelf item.

[James Cook, 2016/10/01 00:16:20]

Hooray for nice docs on property keys.

[msw, 2016/10/03 19:14:22]

Acknowledged.

+ASH_EXPORT extern const aura::WindowProperty<int>* const
+    kShelfIconResourceIdKey;
+
+// A property key to store the id for a window's shelf item.
+ASH_EXPORT extern const aura::WindowProperty<ShelfID>* const kShelfIDKey;
+
+// A property key to store the type of a window's shelf item.
+ASH_EXPORT extern const aura::WindowProperty<int>* const kShelfItemTypeKey;
+
 // Containers with this property (true) are aligned with physical pixel
 // boundary.
 extern const aura::WindowProperty<bool>* const kSnapChildrenToPixelBoundary;
 
 // Property to tell if the container uses the screen coordinates.
 extern const aura::WindowProperty<bool>* const kUsesScreenCoordinatesKey;
 
 // A property key to store WindowState in the window. The window state
 // is owned by the window.
 extern const aura::WindowProperty<wm::WindowState*>* const kWindowStateKey;
 
 // Alphabetical sort.
 
 }  // namespace ash
 
 #endif  // ASH_WM_WINDOW_PROPERTIES_H_