Change Aura overlay scrollbars from solid color to painted scrollbars.

blimp/client/support/compositor/blimp_layer_tree_settings.cc

Index: blimp/client/support/compositor/blimp_layer_tree_settings.cc
diff --git a/blimp/client/support/compositor/blimp_layer_tree_settings.cc b/blimp/client/support/compositor/blimp_layer_tree_settings.cc
index 8c44b6e852d0903c93ecf8693bcc42510089a84b..3515cd084cc1745df452437be2d8bcbc44491123 100644
--- a/blimp/client/support/compositor/blimp_layer_tree_settings.cc
+++ b/blimp/client/support/compositor/blimp_layer_tree_settings.cc
@@ -61,9 +61,10 @@ void PopulateCommonLayerTreeSettings(cc::LayerTreeSettings* settings) {
     settings->gpu_rasterization_enabled = false;
   settings->using_synchronous_renderer_compositor = false;
   settings->scrollbar_animator = cc::LayerTreeSettings::LINEAR_FADE;
-  settings->scrollbar_fade_delay_ms = 300;
-  settings->scrollbar_fade_resize_delay_ms = 2000;
-  settings->scrollbar_fade_duration_ms = 300;
+  settings->scrollbar_fade_delay = base::TimeDelta::FromMilliseconds(300);
+  settings->scrollbar_fade_resize_delay =
+      base::TimeDelta::FromMilliseconds(2000);
+  settings->scrollbar_fade_duration = base::TimeDelta::FromMilliseconds(300);
   settings->solid_color_scrollbar_color = SkColorSetARGB(128, 128, 128, 128);
   settings->renderer_settings.highp_threshold_min = 2048;
   settings->ignore_root_layer_flings = false;
@@ -89,9 +90,10 @@ void PopulateCommonLayerTreeSettings(cc::LayerTreeSettings* settings) {
 #elif !defined(OS_MACOSX)
   settings->scrollbar_animator = cc::LayerTreeSettings::LINEAR_FADE;
   settings->solid_color_scrollbar_color = SkColorSetARGB(128, 128, 128, 128);
-  settings->scrollbar_fade_delay_ms = 500;
-  settings->scrollbar_fade_resize_delay_ms = 500;
-  settings->scrollbar_fade_duration_ms = 300;
+  settings->scrollbar_fade_delay = base::TimeDelta::FromMilliseconds(500);
+  settings->scrollbar_fade_resize_delay =
+      base::TimeDelta::FromMilliseconds(500);
+  settings->scrollbar_fade_duration = base::TimeDelta::FromMilliseconds(300);
 
 // When pinching in, only show the pinch-viewport overlay scrollbars if the
 // page scale is at least some threshold away from the minimum. i.e. don't