Reurns the presentation time. This is the time at which the frame became visible to the user.
the time the frame was displayed to the user, in the timescale of g_get_monotonic_time(), or 0 if no presentation time is available. See gdk_frame_timings_get_complete()
3.8
See Implementation
Reurns the presentation time. This is the time at which the frame became visible to the user.