$ flutter channel master
$ flutter upgrade
$ flutter config --enable-web
#downloads sky_engine and sdk tools then shows devices list
$ flutter devices
$ flutter create test_app
$ flutter run -d chrome
flutter run -d chrome
flutter run -d chrome --web-port 5555
flutter channel master
$ flutter upgrade
$ flutter config --enable-web
#downloads sky_engine and sdk tools then shows devices list
$ flutter devices
$ flutter create test_app
$ flutter run -d chrome