Aura overlay scrollbars adjust color for dark backgrounds

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

 /*
  * Copyright (C) 2004, 2006, 2008 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 76 matching lines @@
 }
 
 void Scrollbar::setFrameRect(const IntRect& frameRect) {
   if (frameRect == this->frameRect())
     return;
 
   Widget::setFrameRect(frameRect);
   setNeedsPaintInvalidation(AllParts);
 }
 
-ScrollbarOverlayStyle Scrollbar::getScrollbarOverlayStyle() const {
-  return m_scrollableArea ? m_scrollableArea->getScrollbarOverlayStyle()
-                          : ScrollbarOverlayStyleDefault;
+ScrollbarOverlayColorTheme Scrollbar::getScrollbarOverlayColorTheme() const {
+  return m_scrollableArea ? m_scrollableArea->getScrollbarOverlayColorTheme()
+                          : ScrollbarOverlayColorThemeDark;
 }
 
 void Scrollbar::getTickmarks(Vector<IntRect>& tickmarks) const {
   if (m_scrollableArea)
     m_scrollableArea->getTickmarks(tickmarks);
 }
 
 bool Scrollbar::isScrollableAreaActive() const {
   return m_scrollableArea && m_scrollableArea->isActive();
 }
@@ skipping 507 matching lines @@
     invalidParts = AllParts;
   if (invalidParts & ~ThumbPart)
     m_trackNeedsRepaint = true;
   if (invalidParts & ThumbPart)
     m_thumbNeedsRepaint = true;
   if (m_scrollableArea)
     m_scrollableArea->setScrollbarNeedsPaintInvalidation(orientation());
 }
 
 }  // namespace blink