Aura overlay scrollbars adjust color for dark backgrounds

third_party/WebKit/Source/platform/scroll/ScrollbarThemeMac.h

 /*
  * Copyright (C) 2008 Apple Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 48 matching lines @@
                       const IntRect&) override;
 
   bool shouldRepaintAllPartsOnInvalidation() const override { return false; }
   ScrollbarPart invalidateOnThumbPositionChange(
       const ScrollbarThemeClient&,
       float oldPosition,
       float newPosition) const override;
   void updateEnabledState(const ScrollbarThemeClient&) override;
   int scrollbarThickness(ScrollbarControlSize = RegularScrollbar) override;
   bool usesOverlayScrollbars() const override;
-  void updateScrollbarOverlayStyle(const ScrollbarThemeClient&) override;
+  void updateScrollbarOverlayColorTheme(const ScrollbarThemeClient&) override;
   WebScrollbarButtonsPlacement buttonsPlacement() const override;
 
   void setNewPainterForScrollbar(ScrollbarThemeClient&, ScrollbarPainter);
   ScrollbarPainter painterForScrollbar(const ScrollbarThemeClient&) const;
 
   void paintTrackBackground(GraphicsContext&,
                             const Scrollbar&,
                             const IntRect&) override;
   void paintThumb(GraphicsContext&, const Scrollbar&, const IntRect&) override;
 
@@ skipping 27 matching lines @@
   bool hasButtons(const ScrollbarThemeClient&) override { return false; }
   bool hasThumb(const ScrollbarThemeClient&) override;
 
   int minimumThumbLength(const ScrollbarThemeClient&) override;
 
   RefPtr<Pattern> m_overhangPattern;
 };
 }
 
 #endif  // ScrollbarThemeMac_h