Imported Upstream version 4.2.0.179

Former-commit-id: 4610231f55806d2a05ed69e5ff3faa7336cc1479

external/referencesource/System.Configuration/System/Configuration/Internal/iconfigsystem.cs

@@ -0,0 +1,18 @@
+//------------------------------------------------------------------------------
+// <copyright file="IConfigSystem.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+
+namespace System.Configuration.Internal {
+
+    using System;
+    using System.Configuration;
+
+    public interface IConfigSystem {
+        void Init(Type typeConfigHost, params object[] hostInitParams);
+
+        IInternalConfigHost Host {get;}
+        IInternalConfigRoot Root {get;}
+    }
+}