Aura overlay scrollbars adjust color for dark backgrounds

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

 /*
  * Copyright (C) 2008, 2011 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 103 matching lines @@
 
   void finishCurrentScrollAnimations() const;
 
   virtual void didAddScrollbar(Scrollbar&, ScrollbarOrientation);
   virtual void willRemoveScrollbar(Scrollbar&, ScrollbarOrientation);
 
   virtual void contentsResized();
 
   bool hasOverlayScrollbars() const;
   void setScrollbarOverlayStyle(ScrollbarOverlayStyle);
-  void recalculateScrollbarOverlayStyle(Color);
-  ScrollbarOverlayStyle getScrollbarOverlayStyle() const {
+  static ScrollbarOverlayStyle calculateScrollbarOverlayStyle(
+      Color backgroundColor);
+  void recalculateScrollbarOverlayStyle(Color, bool isTransparent);
+  virtual ScrollbarOverlayStyle getScrollbarOverlayStyle() const {
     return static_cast<ScrollbarOverlayStyle>(m_scrollbarOverlayStyle);
   }
 
   // This getter will create a ScrollAnimatorBase if it doesn't already exist.
   ScrollAnimatorBase& scrollAnimator() const;
 
   // This getter will return null if the ScrollAnimatorBase hasn't been created
   // yet.
   ScrollAnimatorBase* existingScrollAnimator() const {
     return m_scrollAnimator;
@@ skipping 271 matching lines @@
   // vertical-lr / ltr            NO                      NO
   // vertical-lr / rtl            NO                      YES
   // vertical-rl / ltr            YES                     NO
   // vertical-rl / rtl            YES                     YES
   IntPoint m_scrollOrigin;
 };
 
 }  // namespace blink
 
 #endif  // ScrollableArea_h