wined3d: Create multiple contexts for onscreen render targets.
diff --git a/dlls/wined3d/wined3d_private.h b/dlls/wined3d/wined3d_private.h
index 89f207e..558773c 100644
--- a/dlls/wined3d/wined3d_private.h
+++ b/dlls/wined3d/wined3d_private.h
@@ -1412,6 +1412,8 @@
 
 extern const IWineD3DSwapChainVtbl IWineD3DSwapChain_Vtbl;
 
+WineD3DContext *IWineD3DSwapChainImpl_CreateContextForThread(IWineD3DSwapChain *iface);
+
 /*****************************************************************************
  * Utility function prototypes 
  */