Port custom element layout tests to Dart

tests/html/custom/created_callback_test.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.
+
+library created_callback_test;
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+import 'dart:html';
+
+class A extends HtmlElement {
+  static final tag = 'x-a';
+  factory A() => new Element.tag(tag);
+
+  static int createdInvocations = 0;
+
+  void onCreated() {
+    createdInvocations++;
+  }
+}
+
+class B extends HtmlElement {
+  static final tag = 'x-b';
+  factory B() => new Element.tag(tag);
+}
+
+class C extends HtmlElement {
+  static final tag = 'x-c';
+  factory C() => new Element.tag(tag);
+
+  static int createdInvocations = 0;
+  static var div;
+
+  void onCreated() {
+    createdInvocations++;
+
+    if (this.id != 'u') {
+      return;
+    }
+
+    var t = div.query('#t');
+    var v = div.query('#v');
+    var w = div.query('#w');
+
+    expect(query('x-b:not(:unresolved)'), this);
+    expect(queryAll(':unresolved'), [v, w]);
+
+    // As per:
+    // http://www.w3.org/TR/2013/WD-custom-elements-20130514/#serializing-and-parsing
+    // creation order is t, u, v, w (postorder).
+    expect(t is C, isTrue);
+    // Note, this is different from JavaScript where this would be false.
+    expect(v is C, isTrue);
+  }
+}
+
+main() {
+  useHtmlConfiguration();
+
+  // Adapted from Blink's
+  // fast/dom/custom/created-callback test.
+
+  test('transfer created callback', () {
+    document.register(A.tag, A);
+    var x = new A();
+    expect(A.createdInvocations, 1);
+  });
+
+  test(':unresolved and created callback timing', () {
+    document.register(B.tag, B);
+    document.register(C.tag, C);
+
+    var div = new DivElement();
+    C.div = div;
+    div.innerHtml = """
+<x-c id="t"></x-c>
+<x-b id="u"></x-b>
+<x-c id="v"></x-c>
+<x-b id="w"></x-b>
+""";
+
+    expect(C.createdInvocations, 2);
+    expect(div.query('#w') is B, isTrue);
+  });
+
+  // TODO(vsm): Port additional test from upstream here:
+  // http://src.chromium.org/viewvc/blink/trunk/LayoutTests/fast/dom/custom/created-callback.html?r1=156141&r2=156185
+}