Comment 0 for bug 1440088

Intermittent CI failure in mir_acceptance_tests DisplayBufferCompositorOverride.composite_called_with_surface as seen in:

https://jenkins.qa.ubuntu.com/job/mir-clang-vivid-amd64-build/1944/consoleFull

The failure is reproducible with lp:mir under sufficient stress (running tests repeatedly in one console and "stress -c 4" does the trick for me).