MacViews: Overlay Scrollbars with Show/Hide Animations

ui/views/controls/scrollbar/native_scroll_bar_wrapper.h

Index: ui/views/controls/scrollbar/native_scroll_bar_wrapper.h
diff --git a/ui/views/controls/scrollbar/native_scroll_bar_wrapper.h b/ui/views/controls/scrollbar/native_scroll_bar_wrapper.h
index 6f4e45aee88fdb59e4496abb237105f4c6a5113a..128974992aafde114c5c077d6373ac1cec625765 100644
--- a/ui/views/controls/scrollbar/native_scroll_bar_wrapper.h
+++ b/ui/views/controls/scrollbar/native_scroll_bar_wrapper.h
@@ -38,6 +38,9 @@ class VIEWS_EXPORT NativeScrollBarWrapper {
   // Returns the system sizes of vertical/horizontal scroll bars.
   static int GetVerticalScrollBarWidth(const ui::NativeTheme* theme);
   static int GetHorizontalScrollBarHeight(const ui::NativeTheme* theme);
+
+  // Returns the overlay params for the scrollbar views.
+  virtual ui::NativeTheme::OverlayParams GetOverlayParams();
 };
 
 }  // namespace views