Aura Overlay Scrollbars appear when mouse hovers over scroller edge

cc/trees/layer_tree_settings.h

Index: cc/trees/layer_tree_settings.h
diff --git a/cc/trees/layer_tree_settings.h b/cc/trees/layer_tree_settings.h
index b25a3cd89abe20561f82ce5eff606212cc89bbed..1a5e0344232c9667aade57236640cf7c1dad0754 100644
--- a/cc/trees/layer_tree_settings.h
+++ b/cc/trees/layer_tree_settings.h
@@ -51,9 +51,10 @@ class CC_EXPORT LayerTreeSettings {
     AURA_OVERLAY,
   };
   ScrollbarAnimator scrollbar_animator = NO_ANIMATOR;
-  base::TimeDelta scrollbar_fade_delay;
-  base::TimeDelta scrollbar_fade_resize_delay;
-  base::TimeDelta scrollbar_fade_duration;
+  base::TimeDelta scrollbar_fade_in_delay;
+  base::TimeDelta scrollbar_fade_out_delay;
+  base::TimeDelta scrollbar_fade_out_resize_delay;
+  base::TimeDelta scrollbar_fade_out_duration;
   base::TimeDelta scrollbar_thinning_duration;
   SkColor solid_color_scrollbar_color = SK_ColorWHITE;
   bool timeout_and_draw_when_animation_checkerboards = true;