Aura overlay scrollbars adjust color for dark backgrounds

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

Index: third_party/WebKit/Source/platform/scroll/ScrollbarThemeMac.mm
diff --git a/third_party/WebKit/Source/platform/scroll/ScrollbarThemeMac.mm b/third_party/WebKit/Source/platform/scroll/ScrollbarThemeMac.mm
index 694e822d7f0a8ee2144bb2e2e778f1a0b2348203..60d97556f4c6f11a0934be919c53a2d87cbd020b 100644
--- a/third_party/WebKit/Source/platform/scroll/ScrollbarThemeMac.mm
+++ b/third_party/WebKit/Source/platform/scroll/ScrollbarThemeMac.mm
@@ -287,7 +287,7 @@ void ScrollbarThemeMac::registerScrollbar(ScrollbarThemeClient& scrollbar) {
 
   scrollbarPainterMap().add(&scrollbar, observer);
   updateEnabledState(scrollbar);
-  updateScrollbarOverlayStyle(scrollbar);
+  updateScrollbarOverlayColorTheme(scrollbar);
 }
 
 void ScrollbarThemeMac::unregisterScrollbar(ScrollbarThemeClient& scrollbar) {
@@ -305,7 +305,7 @@ void ScrollbarThemeMac::setNewPainterForScrollbar(
                                                 painter:scrollbarPainter]);
   scrollbarPainterMap().set(&scrollbar, observer);
   updateEnabledState(scrollbar);
-  updateScrollbarOverlayStyle(scrollbar);
+  updateScrollbarOverlayColorTheme(scrollbar);
 }
 
 ScrollbarPainter ScrollbarThemeMac::painterForScrollbar(
@@ -400,17 +400,14 @@ 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;
   }