Until a matching call to [method@Gdk.FrameClock.end_updating] is made,
the frame clock will continually request a new frame with the
%GDK_FRAME_CLOCK_PHASE_UPDATE phase. This function may be called multiple
times and frames will be requested until gdk_frame_clock_end_updating()
is called the same number of times.
Starts updates for an animation.
Until a matching call to [method@Gdk.FrameClock.end_updating] is made, the frame clock will continually request a new frame with the %GDK_FRAME_CLOCK_PHASE_UPDATE phase. This function may be called multiple times and frames will be requested until gdk_frame_clock_end_updating() is called the same number of times.