Add 'owner' field to sockets, that point to a potential IO resource using that Socket.

sdk/lib/io/websocket_impl.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;
 
 const String _webSocketGUID = "258EAFA5-E914-47DA-95CA-C5AB0DC85B11";
 
 // Matches _WebSocketOpcode.
 class _WebSocketMessageType {
@@ skipping 879 matching lines @@
           _controller.close();
         },
         cancelOnError: true);
     _subscription.pause();
     _controller = new StreamController(sync: true,
                                        onListen: _subscription.resume,
                                        onPause: _subscription.pause,
                                        onResume: _subscription.resume);
 
     _webSockets[_serviceId] = this;
+    try { _socket._owner = this; } catch (_) {}
   }
 
   StreamSubscription listen(void onData(message),
                             {Function onError,
                              void onDone(),
                              bool cancelOnError}) {
     return _controller.stream.listen(onData,
                                      onError: onError,
                                      onDone: onDone,
                                      cancelOnError: cancelOnError);
@@ skipping 95 matching lines @@
            (code < WebSocketStatus.NORMAL_CLOSURE ||
             code == WebSocketStatus.RESERVED_1004 ||
             code == WebSocketStatus.NO_STATUS_RECEIVED ||
             code == WebSocketStatus.ABNORMAL_CLOSURE ||
             (code > WebSocketStatus.INTERNAL_SERVER_ERROR &&
              code < WebSocketStatus.RESERVED_1015) ||
             (code >= WebSocketStatus.RESERVED_1015 &&
              code < 3000));
   }
 }