compsitor: Put background surface in the big surface list
compsitor: Put background surface in the big surface list

giucam/weston,giucam/weston,xorgy/weston,kwm81/weston,xorgy/weston,Fantu/compositor-spice,mchalupa/weston,krezovic/weston,eyolfson/weston,jonnylamb/weston,Fantu/compositor-spice,mchalupa/weston,Gnurou/weston,kwm81/weston,Gnurou/weston,eyolfson/weston,udoprog/weston,krezovic/weston,Fantu/compositor-spice,Tarnyko/weston-xdg_surface_present,sir-murray/weston,sir-murray/weston,jonnylamb/weston,Tarnyko/weston-xdg_surface_present,udoprog/weston