xdg-shell: Add toplevel "bounds" configure event

This aims to communicate the maximum size a surface should be created
with, and loosely corresponds to the concept of "work area" in the X11
world.

Closes: wayland/wayland-protocols#17

Signed-off-by: Jonas Ådahl <jadahl@gmail.com>
2 jobs for wip/bounds in 1 minute and 3 seconds (queued for 4 seconds)
Status Name Job ID Coverage
  Containers Build
passed container_build #3938844

00:00:27

 
  Test
passed test #3938845

00:00:35