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 glib.global.getMonotonicTime, or 0 if no presentation time is available. See gdk.frame_timings.FrameTimings.getComplete
Reurns the presentation time.
This is the time at which the frame became visible to the user.