Add documentation for Perfetto and Gfx-pps, together with some perfetto
config files to use as a starting point.
Signed-off-by: Antonio Caggiano <antonio.caggiano@collabora.com>
Signed-off-by: Rob Clark <robdclark@chromium.org>
Acked-by: Emma Anholt <emma@anholt.net>
Reviewed-by: John Bates <jbates@chromium.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/9652>