Fix overlay scroll bar color on elements with dark background

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 11 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef ScrollableArea_h
 #define ScrollableArea_h
 
 #include "platform/PlatformExport.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/geometry/DoublePoint.h"
+#include "platform/graphics/Color.h"
 #include "platform/heap/Handle.h"
 #include "platform/scroll/ScrollAnimatorBase.h"
 #include "platform/scroll/ScrollTypes.h"
 #include "platform/scroll/Scrollbar.h"
 #include "wtf/MathExtras.h"
 #include "wtf/Noncopyable.h"
 #include "wtf/Vector.h"
 
 namespace blink {
 
@@ skipping 73 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 { 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.get(); }
 
     ProgrammaticScrollAnimator& programmaticScrollAnimator() const;
     ProgrammaticScrollAnimator* existingProgrammaticScrollAnimator() const { return m_programmaticScrollAnimator.get(); }
@@ skipping 210 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