present: ftrace PresentPixmap calls and flips

Singular successful PresentPixmap requests and the duration of each flip
are marked in the ftrace output.

Signed-off-by: Roman Gilg <subdiff@gmail.com>
4 jobs for ftraceMarker in 7 minutes (queued for 3 seconds)
latest
Status Name Job ID Coverage
  Docker Image
passed debian-testing #3102287

00:00:29

 
  Build And Test
passed autotools #3102288

00:06:31

passed meson #3102289

00:01:36

passed meson-noglamor #3102290

00:02:00