Add support for Websocket protocols.

sdk/lib/io/http_parser.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.
 
 part of dart.io;
 
 // Global constants.
 class _Const {
   // Bytes for "HTTP".
   static const HTTP = const [72, 84, 84, 80];
@@ skipping 824 matching lines @@
 
   _releaseBuffer() {
     _buffer = null;
     _index = null;
   }
 
   bool _isTokenChar(int byte) {
     return byte > 31 && byte < 128 && !_Const.SEPARATOR_MAP[byte];
   }
 
-  List<String> _tokenizeFieldValue(String headerValue) {
+  static List<String> _tokenizeFieldValue(String headerValue) {
     List<String> tokens = new List<String>();
     int start = 0;
     int index = 0;
     while (index < headerValue.length) {
       if (headerValue[index] == ",") {
         tokens.add(headerValue.substring(start, index));
         start = index + 1;
       } else if (headerValue[index] == " " || headerValue[index] == "\t") {
         start++;
       }
@@ skipping 130 matching lines @@
   _HttpHeaders _headers;
 
   // The current incoming connection.
   _HttpIncoming _incoming;
   StreamSubscription _socketSubscription;
   bool _paused = true;
   bool _bodyPaused = false;
   StreamController<_HttpIncoming> _controller;
   StreamController<List<int>> _bodyController;
 }