Work on D3D11 for various state settings. This code sucks. Needs a rewrite.

src/xenia/gpu/d3d11/d3d11_window.h

@@ -29,6 +29,8 @@ public:
       IDXGIFactory1* dxgi_factory, ID3D11Device* device);
   virtual ~D3D11Window();
 
+  IDXGISwapChain* swap_chain() const { return swap_chain_; }
+
   virtual int Initialize(const char* title, uint32_t width, uint32_t height);
 
   void Swap();