Split ui/display types into separate module and have Ozone depend on it

ui/ozone/ozone_platform.cc

Index: ui/ozone/ozone_platform.cc
diff --git a/ui/ozone/ozone_platform.cc b/ui/ozone/ozone_platform.cc
index 53016cd05edf31327856bab14b9a113f3d9a32a8..feb36baea2a50a3db2b1d25f23b099a67a611a74 100644
--- a/ui/ozone/ozone_platform.cc
+++ b/ui/ozone/ozone_platform.cc
@@ -65,6 +65,12 @@ void OzonePlatform::Initialize() {
 }
 
 // static
+OzonePlatform* OzonePlatform::GetInstance() {
+  CHECK(instance_) << "OzonePlatform is not initialized";
+  return instance_;
+}
+
+// static
 OzonePlatform* OzonePlatform::instance_;
 
 }  // namespace ui