Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.IdentityModel/System/IdentityModel/Policy/EvaluationContext.cs

@@ -0,0 +1,19 @@
+//------------------------------------------------------------
+// Copyright (c) Microsoft Corporation.  All rights reserved.
+//------------------------------------------------------------
+
+namespace System.IdentityModel.Policy
+{
+    using System.Collections.Generic;
+    using System.Collections.ObjectModel;
+    using System.IdentityModel.Claims;
+
+    public abstract class EvaluationContext
+    {
+        public abstract ReadOnlyCollection<ClaimSet> ClaimSets { get; }
+        public abstract IDictionary<string, object> Properties { get; }
+        public abstract int Generation { get; }
+        public abstract void AddClaimSet(IAuthorizationPolicy policy, ClaimSet claimSet);
+        public abstract void RecordExpirationTime(DateTime expirationTime);
+    }
+}