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

sdk/lib/io/http_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 int _OUTGOING_BUFFER_SIZE = 8 * 1024;
 
 class _HttpIncoming extends Stream<List<int>> {
   final int _transferLength;
@@ skipping 2070 matching lines @@
         .then((socket) {
           return new _HttpServer._(socket, true);
         });
   }
 
   _HttpServer._(this._serverSocket, this._closeServer) {
     _controller = new StreamController<HttpRequest>(sync: true,
                                                     onCancel: close);
     idleTimeout = const Duration(seconds: 120);
     _servers[_serviceId] = this;
+    _serverSocket._owner = this;
   }
 
   _HttpServer.listenOn(this._serverSocket) : _closeServer = false {
     _controller = new StreamController<HttpRequest>(sync: true,
                                                     onCancel: close);
     idleTimeout = const Duration(seconds: 120);
     _servers[_serviceId] = this;
+    try { _serverSocket._owner = this; } catch (_) {}
   }
 
   Duration get idleTimeout => _idleTimeout;
 
   void set idleTimeout(Duration duration) {
     if (_idleTimer != null) {
       _idleTimer.cancel();
       _idleTimer = null;
     }
     _idleTimeout = duration;
@@ skipping 346 matching lines @@
 
   InternetAddress get remoteAddress => _socket.remoteAddress;
 
   int get remotePort => _socket.remotePort;
 
   bool setOption(SocketOption option, bool enabled) {
     return _socket.setOption(option, enabled);
   }
 
   Map _toJSON(bool ref) => _socket._toJSON(ref);
+  void set _owner(owner) { _socket._owner = owner; }
 }
 
 
 class _AuthenticationScheme {
   final int _scheme;
 
   static const UNKNOWN = const _AuthenticationScheme(-1);
   static const BASIC = const _AuthenticationScheme(0);
   static const DIGEST = const _AuthenticationScheme(1);
 
@@ skipping 228 matching lines @@
   const _RedirectInfo(this.statusCode, this.method, this.location);
 }
 
 String _getHttpVersion() {
   var version = Platform.version;
   // Only include major and minor version numbers.
   int index = version.indexOf('.', version.indexOf('.') + 1);
   version = version.substring(0, index);
   return 'Dart/$version (dart:io)';
 }