Revert "remove serialization. it's moved to github"

pkg/serialization/test/test_models.dart

+// Copyright (c) 2012, 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.
+
+/** Provides some basic model classes to test serialization. */
+
+part of serialization_test;
+
+class Person {
+  String name, rank, serialNumber;
+  var address;
+}
+
+class Address {
+  String street, city, state, zip;
+  Address();
+  Address.withData(this.street, this.city, this.state, this.zip);
+}
+
+class Various {
+  Various.Foo(this._d, this.e);
+
+  // Field
+  var a;
+
+  // Get/Set pair
+  var _b;
+  get b => _b;
+  set b(value) { _b = value; }
+
+  // Private field (shouldn't be visible)
+  var _c = 'default value';
+
+  // Getter, value is set in the constructor
+  var _d;
+  get d => _d;
+
+  // Final, value set is the constructor.
+  final e;
+
+  // Get without corresponding set
+  get aLength => a.length;
+
+  static String thisShouldBeIgnored = "because it's static";
+  static get thisShouldAlsoBeIgnored => "for the same reason";
+  static set thisShouldAlsoBeIgnored(x) {}
+}
+
+class Node {
+  Node parent;
+  String name;
+  Node(this.name);
+  Node.parentEssential(this.parent);
+  List<Node> children;
+  bool someBoolean = true;
+
+  toString() => "Node($name)";
+}
+
+class NodeEqualByName extends Node {
+  NodeEqualByName(name) : super(name);
+  operator ==(x) => x is NodeEqualByName && name == x.name;
+  get hashCode => name.hashCode;
+}
+
+class Stream {
+  // In a real stream the position wouldn't likely be settable, making
+  // this trickier to reconstruct.
+  List _collection;
+  int position = 0;
+  Stream(this._collection);
+
+  next() => atEnd() ? null : _collection[position++];
+  atEnd() => position >= _collection.length;
+}