info_tren/lib/hidden_webview.dart

import 'package:flutter/widgets.dart';
import 'package:webview_flutter/webview_flutter.dart';

class HiddenWebView extends StatelessWidget {
  final WebView webView;
  final Widget child;

  HiddenWebView({@required this.child, this.webView});

  @override
  Widget build(BuildContext context) {
    return Stack(
      children: <Widget>[
        Offstage(
          offstage: true,
          child: webView,
        ),
        Positioned.fill(child: child)
      ],
    );
  }
}