Add WindowPinType property on arua::Window

ash/mus/window_manager.cc

Index: ash/mus/window_manager.cc
diff --git a/ash/mus/window_manager.cc b/ash/mus/window_manager.cc
index 7daf1484620f7e185a7216c841d714914d680058..8a4112bb0c7494e8d65f41368f0529858987478c 100644
--- a/ash/mus/window_manager.cc
+++ b/ash/mus/window_manager.cc
@@ -27,6 +27,7 @@
 #include "ash/public/cpp/shelf_types.h"
 #include "ash/public/cpp/shell_window_ids.h"
 #include "ash/public/cpp/window_properties.h"
+#include "ash/public/interfaces/window_pin_type.mojom.h"
 #include "ash/root_window_controller.h"
 #include "ash/root_window_settings.h"
 #include "ash/shell.h"
@@ -92,6 +93,9 @@ WindowManager::WindowManager(service_manager::Connector* connector,
       ::wm::kShadowElevationKey,
       ui::mojom::WindowManager::kShadowElevation_Property,
       base::Bind(&::wm::IsValidShadowElevation));
+  property_converter_->RegisterProperty(
+      kWindowPinTypeKey, ash::mojom::kWindowPinType_Property,
+      aura::PropertyConverter::CreateAcceptAnyValueCallback());
 }
 
 WindowManager::~WindowManager() {