Aura overlay scrollbars adjust color for dark backgrounds

third_party/WebKit/public/platform/WebScrollbar.h

 /*
  * Copyright (C) 2012 Google 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 44 matching lines @@
     BackTrackPart = 1 << 2,
     ThumbPart = 1 << 3,
     ForwardTrackPart = 1 << 4,
     BackButtonEndPart = 1 << 5,
     ForwardButtonEndPart = 1 << 6,
     ScrollbarBGPart = 1 << 7,
     TrackBGPart = 1 << 8,
     AllParts = 0xffffffff
   };
 
-  enum ScrollbarOverlayStyle {
-    ScrollbarOverlayStyleDefault,
-    ScrollbarOverlayStyleDark,
-    ScrollbarOverlayStyleLight
+  enum ScrollbarOverlayColorTheme {
+    ScrollbarOverlayColorThemeDefault,
+    ScrollbarOverlayColorThemeDark,
+    ScrollbarOverlayColorThemeLight
   };
 
   virtual ~WebScrollbar() {}
 
   // Return true if this is an overlay scrollbar.
   virtual bool isOverlay() const = 0;
 
   // Gets the current value (i.e. position inside the region).
   virtual int value() const = 0;
 
   virtual WebPoint location() const = 0;
   virtual WebSize size() const = 0;
   virtual bool enabled() const = 0;
   virtual int maximum() const = 0;
   virtual int totalSize() const = 0;
   virtual bool isScrollableAreaActive() const = 0;
   virtual void getTickmarks(WebVector<WebRect>& tickmarks) const = 0;
   virtual ScrollbarControlSize controlSize() const = 0;
   virtual ScrollbarPart pressedPart() const = 0;
   virtual ScrollbarPart hoveredPart() const = 0;
-  virtual ScrollbarOverlayStyle scrollbarOverlayStyle() const = 0;
+  virtual ScrollbarOverlayColorTheme scrollbarOverlayColorTheme() const = 0;
   virtual bool isCustomScrollbar() const = 0;
   virtual Orientation orientation() const = 0;
   virtual bool isLeftSideVerticalScrollbar() const = 0;
   virtual float elasticOverscroll() const = 0;
   virtual void setElasticOverscroll(float) = 0;
 };
 
 }  // namespace blink
 
 #endif