mash: Port mojo:ash_sysui's ContextMenuMus to mojo:ash.

ash/mus/window_manager_application.h

Index: ash/mus/window_manager_application.h
diff --git a/ash/mus/window_manager_application.h b/ash/mus/window_manager_application.h
index 6d55d350ac64c7fab0498db359176dafe0d0e08a..91372b4350a78bec3ae4bfac674becf18e2c664d 100644
--- a/ash/mus/window_manager_application.h
+++ b/ash/mus/window_manager_application.h
@@ -34,6 +34,7 @@ namespace ash {
 namespace mus {
 
 class AcceleratorRegistrarImpl;
+class NativeWidgetFactoryMus;
 class WindowManager;
 
 // Hosts the window manager and the ash system user interface for mash.
@@ -74,6 +75,7 @@ class WindowManagerApplication
   tracing::Provider tracing_;
 
   std::unique_ptr<views::AuraInit> aura_init_;
+  std::unique_ptr<NativeWidgetFactoryMus> native_widget_factory_mus_;
 
   std::unique_ptr<ui::GpuService> gpu_service_;
   std::unique_ptr<views::SurfaceContextFactory> compositor_context_factory_;