#GdkFrameClock internally keeps a history of #GdkFrameTimings
objects for recent frames that can be retrieved with
gdk_frame_clock_get_timings(). The set of stored frames
is the set from the counter values given by
gdk_frame_clock_get_history_start() and
gdk_frame_clock_get_frame_counter(), inclusive.
Return: the frame counter value for the oldest frame
that is available in the internal frame history of the
#GdkFrameClock.
#GdkFrameClock internally keeps a history of #GdkFrameTimings objects for recent frames that can be retrieved with gdk_frame_clock_get_timings(). The set of stored frames is the set from the counter values given by gdk_frame_clock_get_history_start() and gdk_frame_clock_get_frame_counter(), inclusive.
Return: the frame counter value for the oldest frame that is available in the internal frame history of the #GdkFrameClock.