Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.ServiceModel/System/ServiceModel/UnifiedSecurityMode.cs

@@ -0,0 +1,19 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+namespace System.ServiceModel
+{
+    using System;
+    using System.ComponentModel;
+
+    [Flags]
+    internal enum UnifiedSecurityMode
+    {
+        None = 0x001,
+        Transport = 0x004,
+        Message = 0x008,
+        Both = 0x010,
+        TransportWithMessageCredential = 0x020,
+        TransportCredentialOnly = 0x040,
+    }
+}