mustash: Use ui::chromeos::EventRewriter in mus

services/ui/ws/platform_display_default.h

Index: services/ui/ws/platform_display_default.h
diff --git a/services/ui/ws/platform_display_default.h b/services/ui/ws/platform_display_default.h
index 399594c03f9db6f83a73254dde4854c76a6cbd0c..b96b8d09b473060193a68df898aba5d63618c295 100644
--- a/services/ui/ws/platform_display_default.h
+++ b/services/ui/ws/platform_display_default.h
@@ -18,6 +18,7 @@
 
 namespace ui {
 
+class EventSink;
 class ImageCursors;
 class LocatedEvent;
 class PlatformWindow;
@@ -34,6 +35,9 @@ class PlatformDisplayDefault : public PlatformDisplay,
                          const display::ViewportMetrics& metrics);
   ~PlatformDisplayDefault() override;
 
+  // EventSource::
+  EventSink* GetEventSink() override;
+
   // PlatformDisplay:
   void Init(PlatformDisplayDelegate* delegate) override;
   void SetViewportSize(const gfx::Size& size) override;