add Tickmarks to aura overlay scrollbar

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

Index: third_party/WebKit/Source/platform/scroll/ScrollbarThemeAura.cpp
diff --git a/third_party/WebKit/Source/platform/scroll/ScrollbarThemeAura.cpp b/third_party/WebKit/Source/platform/scroll/ScrollbarThemeAura.cpp
index 313a21e6f2ff071a450f4e00f4daf53da268e679..85ebac165fad95fb150eaf1f7cc0e8c88e81ca59 100644
--- a/third_party/WebKit/Source/platform/scroll/ScrollbarThemeAura.cpp
+++ b/third_party/WebKit/Source/platform/scroll/ScrollbarThemeAura.cpp
@@ -225,9 +225,9 @@ int ScrollbarThemeAura::minimumThumbLength(
   return size.width();
 }
 
-void ScrollbarThemeAura::paintTickmarks(GraphicsContext& context,
-                                        const Scrollbar& scrollbar,
-                                        const IntRect& rect) {
+void ScrollbarThemeAura::paintAuraTickmarks(GraphicsContext& context,
+                                            const Scrollbar& scrollbar,
+                                            const IntRect& rect) {
   if (scrollbar.orientation() != VerticalScrollbar)
     return;
 
@@ -265,6 +265,12 @@ void ScrollbarThemeAura::paintTickmarks(GraphicsContext& context,
   }
 }
 
+void ScrollbarThemeAura::paintTickmarks(GraphicsContext& context,
+                                        const Scrollbar& scrollbar,
+                                        const IntRect& rect) {
+  ScrollbarThemeAura::paintAuraTickmarks(context, scrollbar, rect);
+}
+
 void ScrollbarThemeAura::paintTrackBackground(GraphicsContext& context,
                                               const Scrollbar& scrollbar,
                                               const IntRect& rect) {