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 1cf1b5318b176cbb1eefc8fa28e5b2f7fe536704..f3f4c3b1c1dd93ba052cd2488e57c1c0da205eda 100644
--- a/content/renderer/gpu/render_widget_compositor.cc
+++ b/content/renderer/gpu/render_widget_compositor.cc
@@ -444,10 +444,11 @@ 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;