Add all dart:html tests from the sdk to test/codegen.

test/codegen/lib/html/query_test.dart

+// Copyright (c) 2011, 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 QueryTest;
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+import 'dart:html';
+
+main() {
+  useHtmlConfiguration();
+
+  final div = new DivElement();
+  final canvas = new CanvasElement(width: 200, height: 200);
+  canvas.id = 'testcanvas';
+  final element =
+      new Element.html("<div><br/><img/><input/><img/></div>");
+  document.body.nodes.addAll([div, canvas,  element]);
+  
+  var isCanvasElement =
+      predicate((x) => x is CanvasElement, 'is a CanvasElement');
+  var isImageElement =
+      predicate((x) => x is ImageElement, 'is an ImageElement');
+
+  test('query', () {
+      Element e = query('#testcanvas');
+      expect(e, isNotNull);
+      expect(e.id, 'testcanvas');
+      expect(e, isCanvasElement);
+      expect(e, canvas);
+    });
+
+  test('query (None)', () {
+      Element e = query('#nothere');
+      expect(e, isNull);
+    });
+
+  test('queryAll (One)', () {
+      List l = queryAll('canvas');
+      expect(l.length, 1);
+      expect(l[0], canvas);
+    });
+
+
+  test('queryAll (Multiple)', () {
+      List l = queryAll('img');
+      expect(l.length, 2);
+      expect(l[0], isImageElement);
+      expect(l[1], isImageElement);
+      expect(l[0], isNot(equals(l[1])));
+    });
+
+  test('queryAll (None)', () {
+      List l = queryAll('video');
+      expect(l.isEmpty, isTrue);
+    });
+}