anchor.diff:  import 'package:flutter/material.dart';
   import 'package:google_sign_in/google_sign_in.dart';
   import 'dart:async';
  +import 'package:firebase_analytics/firebase_analytics.dart';
   
   final googleSignIn = new GoogleSignIn();
  +final analytics = new FirebaseAnalytics();
   
   void main() {
     runApp(new FriendlychatApp());
  
positive.code:     if (user == null) {
        await googleSignIn.signIn();
      }
    }
  
    Future<Null> _handleSubmitted(String text) async {
  
negative.code:       _messages.insert(0, message);
      });
      message.animationController.forward();
      analytics.logEvent(name: 'send_message');
    }
  
    void dispose() {
  