Add UDP support to dart:io

sdk/lib/_internal/lib/io_patch.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 patch class _Directory {
   patch static _current() {
     throw new UnsupportedError("Directory._current");
   }
   patch static _setCurrent(path) {
     throw new UnsupportedError("Directory_SetCurrent");
@@ skipping 275 matching lines @@
     throw new UnsupportedError("SecureSocket constructor");
   }
 
   patch static void initialize({String database,
                                 String password,
                                 bool useBuiltinRoots: true}) {
     throw new UnsupportedError("SecureSocket.initialize");
   }
 }
 
+patch class RawDatagramSocket {
+  patch static Future<RawDatagramSocket> bind(
+      host, int port, {bool reuseAddress: true}) {
+    throw new UnsupportedError("RawDatagramSocket.bind");
+  }
+}
+
 patch class _SecureFilter {
   patch factory _SecureFilter() {
     throw new UnsupportedError("_SecureFilter._SecureFilter");
   }
 }
 
 patch class _StdIOUtils {
   patch static Stdin _getStdioInputStream() {
     throw new UnsupportedError("StdIOUtils._getStdioInputStream");
   }
@@ skipping 46 matching lines @@
   patch static bool get isSupported {
     throw new UnsupportedError("_FileSystemWatcher.isSupported");
   }
 }
 
 patch class _IOService {
   patch static Future dispatch(int request, List data) {
     throw new UnsupportedError("_IOService.dispatch");
   }
 }