Add HW bounding Box support to d3d backend

Source/Core/VideoBackends/D3D/BoundingBox.h

@@ -0,0 +1,22 @@
+// Copyright 2014 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+#include "VideoBackends/D3D/D3DBase.h"
+
+namespace DX11
+{
+
+class BBox
+{
+public:
+	static ID3D11UnorderedAccessView* &GetUAV();
+	static void Init();
+	static void Shutdown();
+
+	static void Set(int index, int value);
+	static int Get(int index);
+};
+
+};