Add WindowPinType property on arua::Window

ash/public/cpp/window_properties.cc

Index: ash/public/cpp/window_properties.cc
diff --git a/ash/public/cpp/window_properties.cc b/ash/public/cpp/window_properties.cc
index e51444cbfc41b00c968c582d9242dde4e2adb648..918a97d388879464169326e96acf91e92e955363 100644
--- a/ash/public/cpp/window_properties.cc
+++ b/ash/public/cpp/window_properties.cc
@@ -4,10 +4,17 @@
 
 #include "ash/public/cpp/window_properties.h"
 
+#include "ash/public/interfaces/window_pin_type.mojom.h"
+
+DECLARE_EXPORTED_UI_CLASS_PROPERTY_TYPE(ASH_PUBLIC_EXPORT,
+                                        ash::mojom::WindowPinType)
+
 namespace ash {
 
 DEFINE_UI_CLASS_PROPERTY_KEY(bool, kPanelAttachedKey, true);
-
 DEFINE_UI_CLASS_PROPERTY_KEY(int32_t, kShelfItemTypeKey, TYPE_UNDEFINED);
+DEFINE_UI_CLASS_PROPERTY_KEY(ash::mojom::WindowPinType,
+                             kWindowPinTypeKey,
+                             ash::mojom::WindowPinType::NONE);
 
 }  // namespace ash