anchor.diff:  }
   
   class Spark extends Application implements FilesControllerDelegate {
  +  static final _ANALYTICS_ID = 'UA-45578231-1';
  +
     AceEditor editor;
     Workspace workspace;
  +  analytics.Tracker tracker;
   
     PreferenceStore localPrefs;
     PreferenceStore syncPrefs;
  
positive.code: import 'package:chrome_gen/chrome_app.dart' as chrome_gen;
  
  import 'lib/ace.dart';
  import 'lib/app.dart';
  import 'lib/utils.dart';
  import 'lib/preferences.dart';
  
negative.code: 
      localPrefs = PreferenceStore.createLocal();
      syncPrefs = PreferenceStore.createSync();
  
      analytics.getService('Spark').then((service) {
        // Init the analytics tracker with our application ID.
        tracker = service.getTracker(_ANALYTICS_ID);
  
        // Send a page view for the main app page.
        tracker.sendAppView('/');
      });
  
      addParticipant(new _SparkSetupParticipant(this));
  
  