ivi-shell: add shell surface labels

To be used by the Weston timeline feature for identifying surfaces in a
trace. The 'get_label' functionality can also be used by any debugging
code, too.

Signed-off-by: Pekka Paalanen <pekka.paalanen@collabora.co.uk>
Reviewed-by: Eugen Friedrich <friedrix@gmail.com>
1 file changed