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

test/codegen/lib/html/serialized_script_value_test.dart

+library SerializedScriptValueTest;
+import 'package:unittest/unittest.dart';
+import 'package:unittest/html_config.dart';
+import 'dart:html';
+import 'utils.dart';
+
+serializationTest(name, value) => test(name, () {
+    // To check how value is serialized and deserialized, we create a
+    // MessageEvent.
+    final event =
+        new MessageEvent('', data: value, origin: '', lastEventId: '');
+    verifyGraph(value, event.data);
+});
+
+
+main() {
+  useHtmlConfiguration();
+
+  serializationTest('null', null);
+  serializationTest('int', 1);
+  serializationTest('double', 2.39);
+  serializationTest('string', 'hey!');
+
+  final simpleMap = {'a': 100, 'b': 's'};
+  final dagMap = { 'x': simpleMap, 'y': simpleMap };
+  final cyclicMap = { 'b': dagMap };
+  cyclicMap['a'] = cyclicMap;
+  serializationTest('simple map', simpleMap);
+  serializationTest('dag map', dagMap);
+  serializationTest('cyclic map', cyclicMap);
+
+  final simpleList = [ 100, 's'];
+  final dagList = [ simpleList, simpleList ];
+  final cyclicList = [ dagList ];
+  cyclicList.add(cyclicList);
+  serializationTest('simple list', simpleList);
+  serializationTest('dag list', dagList);
+  serializationTest('cyclic list', cyclicList);
+
+  serializationTest('datetime', [new DateTime.now()]);
+
+  var blob = new Blob(
+      ['Indescribable... Indestructible! Nothing can stop it!'],
+      'text/plain');
+  serializationTest('blob', [blob]);
+
+  var canvas = new CanvasElement();
+  canvas.width = 100;
+  canvas.height = 100;
+  var imageData = canvas.context2D.getImageData(0, 0, 1, 1);
+  serializationTest('imagedata', [imageData]);
+}