Add Os Bridge into test framework

tests/gfx/include/os/horizon-ctr.hpp

@@ -0,0 +1,21 @@
+#pragma once
+
+#include <os-ctx.hpp>
+
+namespace PD {
+class HorizonCtr : public PD::OsCtx {
+ public:
+  HorizonCtr(Driver d = Driver::Citro3D) : PD::OsCtx(d) {}
+  ~HorizonCtr() {}
+
+  void Init() override;
+  void Deinit() override;
+  bool Mainloop() override;
+  void ClearViewPort() override;
+  void SwapBuffers() override;
+
+ private:
+  struct Impl;
+  Impl* impl = nullptr;
+};
+}  // namespace PD