change overlay scrollbar hover show to hover fade in

content/renderer/gpu/render_widget_compositor.cc

Index: content/renderer/gpu/render_widget_compositor.cc
diff --git a/content/renderer/gpu/render_widget_compositor.cc b/content/renderer/gpu/render_widget_compositor.cc
index 3d535c5afcbdfab438c0c03d3ac2f09c8f4a4497..fc5a1303cc0245cb6991268c9f8f3a189ad739fd 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -443,10 +443,11 @@ cc::LayerTreeSettings RenderWidgetCompositor::GenerateLayerTreeSettings(
 #if !defined(OS_MACOSX)
   if (ui::IsOverlayScrollbarEnabled()) {
     settings.scrollbar_animator = cc::LayerTreeSettings::AURA_OVERLAY;
-    settings.scrollbar_show_delay = ui::kOverlayScrollbarShowDelay;
+    settings.scrollbar_fade_in_delay = ui::kOverlayScrollbarFadeInDelay;
     settings.scrollbar_fade_out_delay = ui::kOverlayScrollbarFadeOutDelay;
     settings.scrollbar_fade_out_resize_delay =
         ui::kOverlayScrollbarFadeOutDelay;
+    settings.scrollbar_fade_in_duration = ui::kOverlayScrollbarFadeInDuration;
     settings.scrollbar_fade_out_duration = ui::kOverlayScrollbarFadeOutDuration;
     settings.scrollbar_thinning_duration =
         ui::kOverlayScrollbarThinningDuration;