mash: Fix shelf window property use in Chrome.

ash/wm/window_properties.h

Index: ash/wm/window_properties.h
diff --git a/ash/wm/window_properties.h b/ash/wm/window_properties.h
index c6ab3d0e33c0ec8d174427c5ae263c1f51414d7c..65aac254f7a6a7865fa1247fba991ad70df62f60 100644
--- a/ash/wm/window_properties.h
+++ b/ash/wm/window_properties.h
@@ -6,6 +6,7 @@
 #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"
 
@@ -42,6 +43,16 @@ ASH_EXPORT extern const aura::WindowProperty<gfx::Rect*>* const
 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;