Adding additional tests for serialized script value conversions

tests/html/serialized_script_value_test.dart

 library SerializedScriptValueTest;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/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 =
@@ skipping 18 matching lines @@
   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]);
+
+  expect(() {
+    new MessageEvent('', data: new DivElement(), origin: '', lastEventId: '');
+  }, throws);
 }