Wrapping leaf nodes in non polymer elements

runtime/observatory/tests/manual_ui/log.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 import 'dart:async';
 import 'dart:developer' as developer;
 import 'package:logging/logging.dart';
 
 main() {
   Logger.root.level = Level.ALL;
   Logger.root.onRecord.listen((logRecord) {
     developer.log(
         logRecord.message,
         time: logRecord.time,
         sequenceNumber: logRecord.sequenceNumber,
         level: logRecord.level.value,
         name: logRecord.loggerName,
         zone: null,
         error: logRecord.error,
         stackTrace: logRecord.stackTrace);
   });
   new Timer.periodic(new Duration(seconds: 1), (t) {
     Logger.root.info('INFO MESSAGE');
   });
   new Timer.periodic(new Duration(seconds: 1), (t) {
     Logger.root.fine('FINE MESSAGE');
   });
 }