VideoCommon: add milliseconds elapsed time value to pixel shaders as a uniform to be able to support animation effects in custom shaders

Source/Core/VideoCommon/VertexManagerBase.h

@@ -233,8 +233,10 @@ private:
   bool m_allow_background_execution = true;
 
   std::unique_ptr<CustomShaderCache> m_custom_shader_cache;
+  u64 m_ticks_elapsed;
 
   Common::EventHook m_frame_end_event;
+  Common::EventHook m_after_present_event;
 };
 
 extern std::unique_ptr<VertexManagerBase> g_vertex_manager;