Implement ScreenManagerOzoneExternal::RequestCloseDisplay

services/ui/display/screen_manager_ozone_external.h

Index: services/ui/display/screen_manager_ozone_external.h
diff --git a/services/ui/display/screen_manager_ozone_external.h b/services/ui/display/screen_manager_ozone_external.h
index 31a3b6ce899a10edd9ecc626d59cda91a496524e..29b15dfed851d43344853d52bc52f30b87e4a215 100644
--- a/services/ui/display/screen_manager_ozone_external.h
+++ b/services/ui/display/screen_manager_ozone_external.h
@@ -28,6 +28,8 @@ class ScreenManagerOzoneExternal : public ScreenManager {
   int64_t GetPrimaryDisplayId() const override;
   void RequestCloseDisplay(int64_t display_id) override;
 
+  ScreenManagerDelegate* delegate_ = nullptr;
+
   DISALLOW_COPY_AND_ASSIGN(ScreenManagerOzoneExternal);
 };