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 54d36d8b5e860bd2c47674e1a2b075a7af056472..9b72172c49b175585f619d641d9d47c819ab1556 100644
--- a/services/ui/ws/platform_display_default.h
+++ b/services/ui/ws/platform_display_default.h
@@ -13,6 +13,7 @@
 #include "services/ui/ws/frame_generator_delegate.h"
 #include "services/ui/ws/platform_display.h"
 #include "services/ui/ws/platform_display_delegate.h"
+#include "ui/events/event_source.h"
 #include "ui/platform_window/platform_window_delegate.h"
 
 namespace ui {
@@ -25,6 +26,7 @@ namespace ws {
 // PlatformDisplay implementation that connects to a PlatformWindow and
 // FrameGenerator for Chrome OS.
 class PlatformDisplayDefault : public PlatformDisplay,
+                               public ui::EventSource,
                                public ui::PlatformWindowDelegate,
                                public FrameGeneratorDelegate {
  public:
@@ -55,6 +57,9 @@ class PlatformDisplayDefault : public PlatformDisplay,
   // TODO(riajiang): This is totally broken with HDPI.
   void UpdateEventRootLocation(ui::LocatedEvent* event);
 
+  // ui::EventSource:
+  ui::EventProcessor* GetEventProcessor() override;
+
   // ui::PlatformWindowDelegate:
   void OnBoundsChanged(const gfx::Rect& new_bounds) override;
   void OnDamageRect(const gfx::Rect& damaged_region) override;