Fixing DateTime values in dart2js serialized script values.

tests/html/indexeddb_1_test.dart

 library IndexedDB1Test;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_individual_config.dart';
 import 'dart:async';
 import 'dart:html' as html;
 import 'dart:indexed_db' as idb;
 
 const String STORE_NAME = 'TEST';
 const int VERSION = 1;
 
@@ skipping 87 matching lines @@
       db.close();
       expect(object, matcher);
     }).whenComplete(() {
       if (db != null) {
         db.close();
       }
       return html.window.indexedDB.deleteDatabase(dbName);
     });
 };
 
-tests_dynamic() {
-  test('test1', testReadWrite(123, 'Hoot!', equals('Hoot!')));
-  test('test2', testReadWrite(123, 12345, equals(12345)));
-  test('test3', testReadWrite(123, [1, 2, 3], equals([1, 2, 3])));
-  test('test4', testReadWrite(123, [2, 3, 4], equals([2, 3, 4])));
-  test('test4', testReadWrite(123, false, equals(false)));
-}
-
-tests_typed() {
-  test('test1', testReadWriteTyped(123, 'Hoot!', equals('Hoot!')));
-  test('test2', testReadWriteTyped(123, 12345, equals(12345)));
-  test('test3', testReadWriteTyped(123, [1, 2, 3], equals([1, 2, 3])));
-  test('test4', testReadWriteTyped(123, [2, 3, 4], equals([2, 3, 4])));
-  test('test4', testReadWriteTyped(123, false, equals(false)));
+void testTypes(testFunction) {
+  test('String', testFunction(123, 'Hoot!', equals('Hoot!')));
+  test('int', testFunction(123, 12345, equals(12345)));
+  test('List', testFunction(123, [1, 2, 3], equals([1, 2, 3])));
+  test('List 2', testFunction(123, [2, 3, 4], equals([2, 3, 4])));
+  test('bool', testFunction(123, [true, false], equals([true, false])));
+  var now = new DateTime.now();
+  test('DateTime', testFunction(123, now,
+    predicate((date) =>
+      date.millisecondsSinceEpoch == now.millisecondsSinceEpoch)));
 }
 
 main() {
   useHtmlIndividualConfiguration();
 
   // Test that indexed_db is properly flagged as supported or not.
   // Note that the rest of the indexed_db tests assume that this has been
   // checked.
   group('supported', () {
     test('supported', () {
@@ skipping 13 matching lines @@
 
       expect(() {
         var db = html.window.indexedDB;
         db.open('random_db');
       }, expectation);
     });
 
     // Don't bother with these tests if it's unsupported.
     if (idb.IdbFactory.supported) {
       test('upgrade', testUpgrade);
-      tests_dynamic();
-      tests_typed();
+      group('dynamic', () {
+        testTypes(testReadWrite);
+      });
+      group('typed', () {
+        testTypes(testReadWriteTyped);
+      });
     }
   });
 }