Add HttpServerConnection to Observatory.

tests/standalone/io/observatory.dart

-// Copyright (c) 2014, 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.
-
-import 'dart:async';
-import 'dart:convert';
-import 'dart:io';
-import 'dart:mirrors';
-
-import 'package:expect/expect.dart';
-import 'package:async_helper/async_helper.dart';
-
-Map lookupServiceObject(String path) {
-  var io = currentMirrorSystem().findLibrary(const Symbol('dart.io'));
-  var m = MirrorSystem.getSymbol('_serviceObjectHandler', io);
-  var paths = Uri.parse(path).pathSegments;
-  Expect.equals('io', paths.first);
-  return JSON.decode(
-      io.invoke(m, [paths.sublist(1), [], []]).reflectee);
-}
-
-
-String getServicePath(obj) {
-  var io = currentMirrorSystem().findLibrary(const Symbol('dart.io'));
-  var m = MirrorSystem.getSymbol('_getServicePath', io);
-  return io.invoke(m, [obj]).reflectee;
-}
-
-
-Future testHttpServer1() {
-  return HttpServer.bind('localhost', 0).then((server) {
-    var path = getServicePath(server);
-    var map = lookupServiceObject(path);
-    Expect.equals(map['type'], 'HttpServer');
-    Expect.equals(map['id'], path);
-    Expect.equals(map['address'], 'localhost');
-    Expect.equals(map['port'], server.port);
-    Expect.equals(map['closed'], false);
-    Expect.equals(map['idle'], 0);
-    Expect.equals(map['active'], 0);
-    var socket = map['socket'];
-    Expect.equals(socket['type'], '@Socket');
-    Expect.equals(socket['kind'], 'Listening');
-    // Validate owner back-ref.
-    socket = lookupServiceObject(socket['id']);
-    Expect.equals(socket['owner']['id'], path);
-    return server.close();
-  });
-}
-
-
-void main() {
-  final tests = [
-    testHttpServer1(),
-  ];
-
-  asyncStart();
-  // Run one test at a time.
-  Future.forEach(tests, (f) => f)
-      .then((_) {
-        asyncEnd();
-      });
-}