Aura overlay scrollbars adjust color for dark backgrounds

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 54881fe67754302c3d025a0a8288c78e8f692443..c6085cd0fab5025e2258733a653397043bad1c19 100644
--- a/ui/native_theme/native_theme_base.cc
+++ b/ui/native_theme/native_theme_base.cc
@@ -161,7 +161,8 @@ void NativeThemeBase::PaintStateTransition(SkCanvas* canvas,
                                            State startState,
                                            State endState,
                                            double progress,
-                                           const gfx::Rect& rect) const {
+                                           const gfx::Rect& rect,
+                                           ScrollbarOverlayStyle style) const {
   if (rect.IsEmpty())
     return;
 
@@ -171,7 +172,7 @@ void NativeThemeBase::PaintStateTransition(SkCanvas* canvas,
     case kScrollbarHorizontalThumb:
     case kScrollbarVerticalThumb:
       PaintScrollbarThumbStateTransition(canvas, part, startState, endState,
-                                         progress, rect);
+                                         progress, rect, style);
       break;
     default:
       NOTREACHED() << "Does not support state transition for this part:"
@@ -227,7 +228,7 @@ void NativeThemeBase::Paint(SkCanvas* canvas,
       break;
     case kScrollbarHorizontalThumb:
     case kScrollbarVerticalThumb:
-      PaintScrollbarThumb(canvas, part, state, rect);
+      PaintScrollbarThumb(canvas, part, state, rect, extra.scrollbar_style);
       break;
     case kScrollbarHorizontalTrack:
     case kScrollbarVerticalTrack:
@@ -436,7 +437,8 @@ void NativeThemeBase::PaintScrollbarTrack(SkCanvas* canvas,
 void NativeThemeBase::PaintScrollbarThumb(SkCanvas* canvas,
                                            Part part,
                                            State state,
-                                           const gfx::Rect& rect) const {
+                                           const gfx::Rect& rect,
+                                           ScrollbarOverlayStyle style) const {
   const bool hovered = state == kHovered;
   const int midx = rect.x() + rect.width() / 2;
   const int midy = rect.y() + rect.height() / 2;