Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/mscorlib/system/iasyncresult.cs

@@ -0,0 +1,33 @@
+// ==++==
+// 
+//   Copyright (c) Microsoft Corporation.  All rights reserved.
+// 
+// ==--==
+/*============================================================
+**
+** Interface: IAsyncResult
+**
+** Purpose: Interface to encapsulate the results of an async
+**          operation
+**
+===========================================================*/
+namespace System {
+    
+    using System;
+    using System.Threading;
+[System.Runtime.InteropServices.ComVisible(true)]
+    public interface IAsyncResult
+    {
+        bool IsCompleted { get; }
+
+        WaitHandle AsyncWaitHandle { get; }
+
+
+        Object     AsyncState      { get; }
+
+        bool       CompletedSynchronously { get; }
+   
+    
+    }
+
+}