Adding additional tests for serialized script value conversions

tests/html/serialized_script_value_test.dart

Index: tests/html/serialized_script_value_test.dart
diff --git a/tests/html/serialized_script_value_test.dart b/tests/html/serialized_script_value_test.dart
index afbf04cb9ed6f3b9aba2baf0c462862b717c7744..280dce3cb7ddb1d9acc4b00abbdd66f3696588fa 100644
--- a/tests/html/serialized_script_value_test.dart
+++ b/tests/html/serialized_script_value_test.dart
@@ -36,4 +36,21 @@ main() {
   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);
 }