Aura overlay scrollbars adjust color for dark backgrounds

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

 /*
  * Copyright (C) 2004, 2006 Apple Computer, 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 63 matching lines @@
   int height() const override { return Widget::height(); }
   IntSize size() const override { return Widget::size(); }
   IntPoint location() const override { return Widget::location(); }
 
   Widget* parent() const override { return Widget::parent(); }
   Widget* root() const override { return Widget::root(); }
 
   void setFrameRect(const IntRect&) override;
   IntRect frameRect() const override { return Widget::frameRect(); }
 
-  ScrollbarOverlayStyle getScrollbarOverlayStyle() const override;
+  ScrollbarOverlayColorTheme getScrollbarOverlayColorTheme() const override;
   void getTickmarks(Vector<IntRect>&) const override;
   bool isScrollableAreaActive() const override;
 
   IntPoint convertFromRootFrame(
       const IntPoint& pointInRootFrame) const override {
     return Widget::convertFromRootFrame(pointInRootFrame);
   }
 
   bool isCustomScrollbar() const override { return false; }
   ScrollbarOrientation orientation() const override { return m_orientation; }
@@ skipping 160 matching lines @@
 
 DEFINE_TYPE_CASTS(Scrollbar,
                   Widget,
                   widget,
                   widget->isScrollbar(),
                   widget.isScrollbar());
 
 }  // namespace blink
 
 #endif  // Scrollbar_h