Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.ServiceModel/System/ServiceModel/Channels/CompressionFormat.cs

@@ -0,0 +1,26 @@
+// <copyright>
+//   Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+namespace System.ServiceModel.Channels
+{
+    /// <summary>
+    /// Supported compression formats
+    /// </summary>
+    public enum CompressionFormat
+    {
+        /// <summary>
+        /// Default to compression off
+        /// </summary>
+        None,
+
+        /// <summary>
+        /// GZip compression
+        /// </summary>
+        GZip,
+
+        /// <summary>
+        /// Deflate compression
+        /// </summary>
+        Deflate,
+    }
+}