Aura overlay scrollbars adjust color for dark backgrounds

third_party/WebKit/Source/platform/scroll/ScrollbarThemeMac.mm

 /*
  * 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 269 matching lines @@
                             controlSize:(NSControlSize)scrollbar.controlSize()
                              horizontal:isHorizontal
                    replacingScrollerImp:nil] retain]);
   RetainPtr<BlinkScrollbarObserver> observer(
       AdoptNS,
       [[BlinkScrollbarObserver alloc] initWithScrollbar:&scrollbar
                                                 painter:scrollbarPainter]);
 
   scrollbarPainterMap().add(&scrollbar, observer);
   updateEnabledState(scrollbar);
-  updateScrollbarOverlayStyle(scrollbar);
+  updateScrollbarOverlayColorTheme(scrollbar);
 }
 
 void ScrollbarThemeMac::unregisterScrollbar(ScrollbarThemeClient& scrollbar) {
   scrollbarPainterMap().remove(&scrollbar);
   scrollbarSet().remove(&scrollbar);
 }
 
 void ScrollbarThemeMac::setNewPainterForScrollbar(
     ScrollbarThemeClient& scrollbar,
     ScrollbarPainter newPainter) {
   RetainPtr<ScrollbarPainter> scrollbarPainter(AdoptNS, [newPainter retain]);
   RetainPtr<BlinkScrollbarObserver> observer(
       AdoptNS,
       [[BlinkScrollbarObserver alloc] initWithScrollbar:&scrollbar
                                                 painter:scrollbarPainter]);
   scrollbarPainterMap().set(&scrollbar, observer);
   updateEnabledState(scrollbar);
-  updateScrollbarOverlayStyle(scrollbar);
+  updateScrollbarOverlayColorTheme(scrollbar);
 }
 
 ScrollbarPainter ScrollbarThemeMac::painterForScrollbar(
     const ScrollbarThemeClient& scrollbar) const {
   return [scrollbarPainterMap()
               .get(const_cast<ScrollbarThemeClient*>(&scrollbar))
               .get() painter];
 }
 
 void ScrollbarThemeMac::paintTrackBackground(GraphicsContext& context,
@@ skipping 74 matching lines @@
   int thickness = [scrollbarPainter trackBoxWidth];
   if (supportsExpandedScrollbars())
     [scrollbarPainter setExpanded:wasExpanded];
   return thickness;
 }
 
 bool ScrollbarThemeMac::usesOverlayScrollbars() const {
   return recommendedScrollerStyle() == NSScrollerStyleOverlay;
 }
 
-void ScrollbarThemeMac::updateScrollbarOverlayStyle(
+void ScrollbarThemeMac::updateScrollbarOverlayColorTheme(
     const ScrollbarThemeClient& scrollbar) {
   ScrollbarPainter painter = painterForScrollbar(scrollbar);
-  switch (scrollbar.getScrollbarOverlayStyle()) {
-    case ScrollbarOverlayStyleDefault:
-      [painter setKnobStyle:NSScrollerKnobStyleDefault];
-      break;
-    case ScrollbarOverlayStyleDark:
+  switch (scrollbar.getScrollbarOverlayColorTheme()) {
+    case ScrollbarOverlayColorThemeDark:
       [painter setKnobStyle:NSScrollerKnobStyleDark];
       break;
-    case ScrollbarOverlayStyleLight:
+    case ScrollbarOverlayColorThemeLight:
       [painter setKnobStyle:NSScrollerKnobStyleLight];
       break;
   }
 }
 
 WebScrollbarButtonsPlacement ScrollbarThemeMac::buttonsPlacement() const {
   return WebScrollbarButtonsPlacementNone;
 }
 
 bool ScrollbarThemeMac::hasThumb(const ScrollbarThemeClient& scrollbar) {
@@ skipping 46 matching lines @@
 }
 
 // static
 NSScrollerStyle ScrollbarThemeMac::recommendedScrollerStyle() {
   if (RuntimeEnabledFeatures::overlayScrollbarsEnabled())
     return NSScrollerStyleOverlay;
   return gPreferredScrollerStyle;
 }
 
 }  // namespace blink