Add mojom::DisplayController.

services/ui/display/platform_screen_ozone_unittests.cc

Index: services/ui/display/platform_screen_ozone_unittests.cc
diff --git a/services/ui/display/platform_screen_ozone_unittests.cc b/services/ui/display/platform_screen_ozone_unittests.cc
index e150bb589f81f48069e5fe7d5309a5434a4c5dc8..1375b8b5a6b62c051e914f44f60c804ebcc23bea 100644
--- a/services/ui/display/platform_screen_ozone_unittests.cc
+++ b/services/ui/display/platform_screen_ozone_unittests.cc
@@ -79,9 +79,7 @@ class TestPlatformScreenDelegate : public PlatformScreenDelegate {
   }
 
  private:
-  void OnDisplayAdded(PlatformScreen* platform_screen,
-                      int64_t id,
-                      const gfx::Rect& bounds) override {
+  void OnDisplayAdded(int64_t id, const gfx::Rect& bounds) override {
     added_.push_back({id, bounds});
   }