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