GType gdk_frame_clock_get_type (void) G_GNUC_CONST;
-guint64 gdk_frame_clock_get_frame_time (GdkFrameClock *frame_clock);
+gint64 gdk_frame_clock_get_frame_time (GdkFrameClock *frame_clock);
GDK_AVAILABLE_IN_3_8
void gdk_frame_clock_request_phase (GdkFrameClock *frame_clock,