anchor.diff:    _playground = new PlaygroundMobile();
   }
   
  -enum FileType {
  +enum _FileType {
     DART, CSS, HTML
   }
   
  
positive.code:   }
    
    void _setBackup () {
      _lastRun = new Map<FileType, String>();
      _lastRun[FileType.DART] = context.dartSource;
      _lastRun[FileType.HTML] = context.htmlSource;
      _lastRun[FileType.CSS] = context.cssSource;
    }
    
    void _setGistId(String id) {
  
negative.code:   PaperIconButton _resetButton;
    PaperTabs _tabs;
  
    Map<_FileType, String> _lastRun;
    Router _router;
    
    CompileResponse _cachedCompile;
  