[mutter] clutte/stage-view: Add refresh rate getter

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

commit 3aff7550480aede6b5c49efb684f321b7dae50f1
Author: Jonas Ådahl <jadahl gmail com>
Date:   Fri May 22 22:59:57 2020 +0200

    clutte/stage-view: Add refresh rate getter
    
    Will be used to find the view with the most appropriate refresh rate
    (e.g. the fastest).
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1285

 clutter/clutter/clutter-stage-view-private.h | 2 ++
 clutter/clutter/clutter-stage-view.c         | 9 +++++++++
 2 files changed, 11 insertions(+)
---
diff --git a/clutter/clutter/clutter-stage-view-private.h b/clutter/clutter/clutter-stage-view-private.h
index 85d02e9de5..2cdcde12b6 100644
--- a/clutter/clutter/clutter-stage-view-private.h
+++ b/clutter/clutter/clutter-stage-view-private.h
@@ -63,6 +63,8 @@ void clutter_stage_view_transform_rect_to_onscreen (ClutterStageView
                                                     int                          dst_height,
                                                     cairo_rectangle_int_t       *dst_rect);
 
+float clutter_stage_view_get_refresh_rate (ClutterStageView *view);
+
 ClutterFrameClock * clutter_stage_view_get_frame_clock (ClutterStageView *view);
 
 #endif /* __CLUTTER_STAGE_VIEW_PRIVATE_H__ */
diff --git a/clutter/clutter/clutter-stage-view.c b/clutter/clutter/clutter-stage-view.c
index 83ffe4e837..caf1677821 100644
--- a/clutter/clutter/clutter-stage-view.c
+++ b/clutter/clutter/clutter-stage-view.c
@@ -1001,6 +1001,15 @@ clutter_stage_view_take_scanout (ClutterStageView *view)
   return g_steal_pointer (&priv->next_scanout);
 }
 
+float
+clutter_stage_view_get_refresh_rate (ClutterStageView *view)
+{
+  ClutterStageViewPrivate *priv =
+    clutter_stage_view_get_instance_private (view);
+
+  return priv->refresh_rate;
+}
+
 ClutterFrameClock *
 clutter_stage_view_get_frame_clock (ClutterStageView *view)
 {