Fixing SerializedScriptValue letting Dart list members through to native lists.

tests/html/indexeddb_2_test.dart

 library IndexedDB1Test;
 import '../../pkg/unittest/lib/unittest.dart';
 import '../../pkg/unittest/lib/html_config.dart';
 import 'dart:async';
 import 'dart:html' as html;
 import 'dart:indexed_db' as idb;
 import 'dart:collection';
 import 'utils.dart';
 
 // Write and re-read Maps: simple Maps; Maps with DAGs; Maps with cycles.
@@ skipping 28 matching lines @@
       db.close();
       check(value, object);
     }).catchError((e) {
       if (db != null) {
         db.close();
       }
       throw e;
     });
 }
 
+List<String> get nonNativeListData {
+  var list = new List<String>();
+  list.add("data");
+  list.add("clone");
+  list.add("error");
+  list.add("test");
+  return list;
+}
 
 main() {
   useHtmlConfiguration();
 
   var obj1 = {'a': 100, 'b': 's'};
   var obj2 = {'x': obj1, 'y': obj1};  // DAG.
 
   var obj3 = {};
   obj3['a'] = 100;
   obj3['b'] = obj3;  // Cycle.
@@ skipping 27 matching lines @@
   if (idb.IdbFactory.supported) {
     go('test_simple', obj1);
     go('test_DAG', obj2);
     go('test_cycle', obj3);
     go('test_simple_splay', obj4);
     go('const_array_1', const [const [1], const [2]]);
     go('const_array_dag', const [const [1], const [1]]);
     go('array_deferred_copy', [1,2,3, obj3, obj3, 6]);
     go('array_deferred_copy_2', [1,2,3, [4, 5, obj3], [obj3, 6]]);
     go('cyclic_list', cyclic_list);
+    go('non-native lists', nonNativeListData);
   }
 }