This makes sure calling Start() and Stop() doesn't work, since we're always recording. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2846>
This is helpful to e.g. trace e.g. launching. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2678>
It's not really a backend thing, and we'll want to profile e.g. loading the backend too, so create it very early and destroy it very late and let MetaContextMain own it. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2678>