Overlay scrollbars flush with window edge

ui/native_theme/native_theme_base.cc

Index: ui/native_theme/native_theme_base.cc
diff --git a/ui/native_theme/native_theme_base.cc b/ui/native_theme/native_theme_base.cc
index 4a2fb957ed0f5ebfbc1249410ed20b8e6ee846ab..37e87fcea627200bd9aab433f50bad45f1bf61ce 100644
--- a/ui/native_theme/native_theme_base.cc
+++ b/ui/native_theme/native_theme_base.cc
@@ -211,8 +211,7 @@ void NativeThemeBase::Paint(cc::PaintCanvas* canvas,
       break;
     case kScrollbarHorizontalThumb:
     case kScrollbarVerticalThumb:
-      PaintScrollbarThumb(canvas, part, state, rect,
-                          extra.scrollbar_thumb.scrollbar_theme);
+      PaintScrollbarThumb(canvas, part, state, rect, extra.scrollbar_thumb);
       break;
     case kScrollbarHorizontalTrack:
     case kScrollbarVerticalTrack:
@@ -434,11 +433,12 @@ void NativeThemeBase::PaintScrollbarTrack(
   DrawBox(canvas, rect, flags);
 }
 
-void NativeThemeBase::PaintScrollbarThumb(cc::PaintCanvas* canvas,
-                                          Part part,
-                                          State state,
-                                          const gfx::Rect& rect,
-                                          ScrollbarOverlayColorTheme) const {
+void NativeThemeBase::PaintScrollbarThumb(
+    cc::PaintCanvas* canvas,
+    Part part,
+    State state,
+    const gfx::Rect& rect,
+    const NativeTheme::ScrollbarThumbExtraParams&) const {
   const bool hovered = state == kHovered;
   const int midx = rect.x() + rect.width() / 2;
   const int midy = rect.y() + rect.height() / 2;