[mutter/gbsneto/charts: 48/50] clutter/stage: Add private getter to sync delay

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 6350efc28ee21b2a3fd4c6669bcf50a85f24926b
Author: Georges Basile Stavracas Neto <georges stavracas gmail com>
Date:   Wed Mar 27 10:53:46 2019 -0300

    clutter/stage: Add private getter to sync delay
    
    It will be used by the frame chart to correctly place
    the red bar. The math is essentially:
    
      ms_per_frame = (1 / refresh rate) * 1000 - sync delay
    
    https://gitlab.gnome.org/GNOME/mutter/merge_requests/502

 clutter/clutter/clutter-stage-private.h | 2 ++
 clutter/clutter/clutter-stage.c         | 8 ++++++++
 2 files changed, 10 insertions(+)
---
diff --git a/clutter/clutter/clutter-stage-private.h b/clutter/clutter/clutter-stage-private.h
index 4799c29e1..cb887ea32 100644
--- a/clutter/clutter/clutter-stage-private.h
+++ b/clutter/clutter/clutter-stage-private.h
@@ -134,6 +134,8 @@ void            _clutter_stage_presented                (ClutterStage      *stag
 
 GList *         _clutter_stage_peek_stage_views         (ClutterStage *stage);
 
+int             clutter_stage_get_sync_delay            (ClutterStage *stage);
+
 G_END_DECLS
 
 #endif /* __CLUTTER_STAGE_PRIVATE_H__ */
diff --git a/clutter/clutter/clutter-stage.c b/clutter/clutter/clutter-stage.c
index 25ce9d899..1cb5cb9b6 100644
--- a/clutter/clutter/clutter-stage.c
+++ b/clutter/clutter/clutter-stage.c
@@ -4722,6 +4722,14 @@ clutter_stage_set_sync_delay (ClutterStage *stage,
   stage->priv->sync_delay = sync_delay;
 }
 
+int
+clutter_stage_get_sync_delay (ClutterStage *stage)
+{
+  g_return_val_if_fail (CLUTTER_IS_STAGE (stage), -1);
+
+  return stage->priv->sync_delay;
+}
+
 /**
  * clutter_stage_skip_sync_delay:
  * @stage: a #ClutterStage