Right now some first-party plugins are using the Flutter driver extension, e.g. Google Maps:

https://github.com/flutter/plugins/blob/abb77340fcff49cffd1e48985e87fd7b4eaf5b84/packages/google_maps_flutter/example/test_driver/google_maps_test.dart

We should upgrade all of them to use e2e plugin for Dart integration tests.