stage-cogl: Don't mess with the damage_history list when buffer_age is not available
stage-cogl: Don't mess with the damage_history list when buffer_age is not available

jigpu/clutter,jigpu/clutter,GNOME/clutter,djdeath/clutter,Distrotech/clutter,jigpu/clutter,ebassi/clutter,ebassi/clutter,djdeath/clutter,djdeath/clutter,ebassi/clutter,ebassi/clutter,GNOME/clutter,djdeath/clutter,Distrotech/clutter,djdeath/clutter,Distrotech/clutter,GNOME/clutter,Distrotech/clutter,djdeath/clutter,jigpu/clutter,jigpu/clutter,jigpu/clutter,Distrotech/clutter,GNOME/clutter,Distrotech/clutter,ebassi/clutter,GNOME/clutter