/usr/include/mirserver/mir/scene/ is in libmirserver-dev 0.26.3+16.04.20170605-0ubuntu1.1.
This file is owned by root:root, with mode 0o755.
..
/usr/include/mirserver/mir/scene/application_not_responding_detector.h
/usr/include/mirserver/mir/scene/application_not_responding_detector_wrapper.h
/usr/include/mirserver/mir/scene/buffer_stream_factory.h
/usr/include/mirserver/mir/scene/coordinate_translator.h
/usr/include/mirserver/mir/scene/null_session_listener.h
/usr/include/mirserver/mir/scene/null_surface_observer.h
/usr/include/mirserver/mir/scene/observer.h
/usr/include/mirserver/mir/scene/prompt_session.h
/usr/include/mirserver/mir/scene/prompt_session_creation_parameters.h
/usr/include/mirserver/mir/scene/prompt_session_listener.h
/usr/include/mirserver/mir/scene/prompt_session_manager.h
/usr/include/mirserver/mir/scene/session.h
/usr/include/mirserver/mir/scene/session_coordinator.h
/usr/include/mirserver/mir/scene/session_listener.h
/usr/include/mirserver/mir/scene/snapshot.h
/usr/include/mirserver/mir/scene/surface.h
/usr/include/mirserver/mir/scene/surface_creation_parameters.h
/usr/include/mirserver/mir/scene/surface_factory.h
/usr/include/mirserver/mir/scene/surface_observer.h