Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/System.Runtime.Serialization/System/Xml/XmlWriteBase64AsyncArgs.cs

@@ -0,0 +1,17 @@
+// <copyright>
+//   Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+
+namespace System.Xml
+{
+    class XmlWriteBase64AsyncArguments
+    {
+        internal byte[] Buffer { get; set; }
+
+        internal int Index { get; set; }
+
+        internal int Count { get; set; }
+
+        internal int Offset { get; set; }
+    }
+}