Fix overlay scroll bar color on elements with dark background

third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.h

 /*
  * Copyright (C) 2003, 2009, 2012 Apple Inc. All rights reserved.
  *
  * Portions are Copyright (C) 1998 Netscape Communications Corporation.
  *
  * Other contributors:
  *   Robert O'Callahan <roc+@cs.cmu.edu>
  *   David Baron <dbaron@fas.harvard.edu>
  *   Christian Biesinger <cbiesinger@web.de>
  *   Randall Jesup <rjesup@wgate.com>
@@ skipping 116 matching lines @@
         // setHas*Scrollbar(true) is called, the existing scrollbar will be reattached.  When
         // setCanDetachScrollbars(false) is called, any detached scrollbars will be destructed.
         bool canDetachScrollbars() const { return m_canDetachScrollbars; }
         void setCanDetachScrollbars(bool);
 
         Scrollbar* horizontalScrollbar() const { return m_hBarIsAttached ? m_hBar.get(): nullptr; }
         Scrollbar* verticalScrollbar() const { return m_vBarIsAttached ? m_vBar.get() : nullptr; }
         bool hasHorizontalScrollbar() const { return horizontalScrollbar(); }
         bool hasVerticalScrollbar() const { return verticalScrollbar(); }
 
-        void setHasHorizontalScrollbar(bool hasScrollbar);
-        void setHasVerticalScrollbar(bool hasScrollbar);
+        void setHasHorizontalScrollbar(bool hasScrollbar, bool useCustomScrollbarStyle);
+        void setHasVerticalScrollbar(bool hasScrollbar, bool useCustomScrollbarStyle);
 
         DECLARE_TRACE();
 
     private:
-        PassRefPtrWillBeRawPtr<Scrollbar> createScrollbar(ScrollbarOrientation);
+        PassRefPtrWillBeRawPtr<Scrollbar> createScrollbar(ScrollbarOrientation, bool useCustomScrollbarStyle);
         void destroyScrollbar(ScrollbarOrientation);
 
     private:
         RawPtrWillBeMember<PaintLayerScrollableArea> m_scrollableArea;
 
         // The scrollbars associated with m_scrollableArea. Both can nullptr.
         RefPtrWillBeMember<Scrollbar> m_hBar;
         RefPtrWillBeMember<Scrollbar> m_vBar;
 
         unsigned m_canDetachScrollbars: 1;
@@ skipping 188 matching lines @@
 
 private:
     explicit PaintLayerScrollableArea(PaintLayer&);
 
     bool hasHorizontalOverflow() const;
     bool hasVerticalOverflow() const;
     bool hasScrollableHorizontalOverflow() const;
     bool hasScrollableVerticalOverflow() const;
     bool visualViewportSuppliesScrollbars() const;
 
+    bool useCustomScrollbarStyle() const;
     bool needsScrollbarReconstruction() const;
 
     void computeScrollDimensions();
 
     void setScrollOffset(const IntPoint&, ScrollType) override;
     void setScrollOffset(const DoublePoint&, ScrollType) override;
 
     int verticalScrollbarStart(int minX, int maxX) const;
     int horizontalScrollbarStart(int minX) const;
     IntSize scrollbarOffset(const Scrollbar&) const;
@@ skipping 63 matching lines @@
 #endif
 };
 
 DEFINE_TYPE_CASTS(PaintLayerScrollableArea, ScrollableArea, scrollableArea,
     scrollableArea->isPaintLayerScrollableArea(),
     scrollableArea.isPaintLayerScrollableArea());
 
 } // namespace blink
 
 #endif // LayerScrollableArea_h