1c20ba4c32
We will soon need to use CoglOnscreen frame events communicate cursor plane changes; this means we need to have a way to queue them without going through any of the current APIs that can do so, i.e. the swap buffer functions and direct scanout. Add a function that just adds a frame info to the queue. The one who adds it is responsible for emitting it too. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1488>