Overlay scrollbars flush with window edge

ui/native_theme/native_theme_aura.h

Index: ui/native_theme/native_theme_aura.h
diff --git a/ui/native_theme/native_theme_aura.h b/ui/native_theme/native_theme_aura.h
index eeebd051e3c120f29b881c8c55eea8c8a073be70..2326d183207f4cb87ba13eddf3b6fc8584d77b30 100644
--- a/ui/native_theme/native_theme_aura.h
+++ b/ui/native_theme/native_theme_aura.h
@@ -42,11 +42,12 @@ class NATIVE_THEME_EXPORT NativeThemeAura : public NativeThemeBase {
                            State state,
                            const ScrollbarTrackExtraParams& extra_params,
                            const gfx::Rect& rect) const override;
-  void PaintScrollbarThumb(cc::PaintCanvas* canvas,
-                           Part part,
-                           State state,
-                           const gfx::Rect& rect,
-                           ScrollbarOverlayColorTheme theme) const override;
+  void PaintScrollbarThumb(
+      cc::PaintCanvas* canvas,
+      Part part,
+      State state,
+      const gfx::Rect& rect,
+      const NativeTheme::ScrollbarThumbExtraParams& params) const override;
   void PaintScrollbarCorner(cc::PaintCanvas* canvas,
                             State state,
                             const gfx::Rect& rect) const override;