Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

external/referencesource/System.Web.Extensions/ui/ScriptDescriptor.cs

@@ -0,0 +1,20 @@
+//------------------------------------------------------------------------------
+// <copyright file="ScriptDescriptor.cs" company="Microsoft">
+//     Copyright (c) Microsoft Corporation.  All rights reserved.
+// </copyright>
+//------------------------------------------------------------------------------
+ 
+namespace System.Web.UI {
+    using System;
+    using System.Diagnostics.CodeAnalysis;
+    using System.Web;
+
+    public abstract class ScriptDescriptor {
+        [SuppressMessage("Microsoft.Design", "CA1024:UsePropertiesWhereAppropriate",
+            Justification = "Implementation will likely be too slow for a property")]
+        protected internal abstract string GetScript();
+
+        internal virtual void RegisterDisposeForDescriptor(ScriptManager scriptManager, Control owner) {
+        }
+    }
+}