Fix overlay scroll bar color on elements with dark background

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

Index: third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.h
diff --git a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.h b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.h
index 3a8fb5158e1f88eed429fb435c0b12cdfa029957..d7346cc9391379890b7ee7e345c5760289c86ea4 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.h
+++ b/third_party/WebKit/Source/core/paint/PaintLayerScrollableArea.h
@@ -134,13 +134,13 @@ private:
         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:
@@ -349,6 +349,7 @@ private:
     bool hasScrollableVerticalOverflow() const;
     bool visualViewportSuppliesScrollbars() const;
 
+    bool useCustomScrollbarStyle() const;
     bool needsScrollbarReconstruction() const;
 
     void computeScrollDimensions();