add Tickmarks to aura overlay scrollbar

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

 /*
  * Copyright (c) 2009, 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 36 matching lines @@
   IntRect backButtonRect(const ScrollbarThemeClient&,
                          ScrollbarPart,
                          bool painting = false) override;
   IntRect forwardButtonRect(const ScrollbarThemeClient&,
                             ScrollbarPart,
                             bool painting = false) override;
   IntRect trackRect(const ScrollbarThemeClient&,
                     bool painting = false) override;
   int minimumThumbLength(const ScrollbarThemeClient&) override;
 
-  void paintTickmarks(GraphicsContext&,
-                      const Scrollbar&,
-                      const IntRect&) override;
   void paintTrackBackground(GraphicsContext&,
                             const Scrollbar&,
                             const IntRect&) override;
   void paintTrackPiece(GraphicsContext&,
                        const Scrollbar&,
                        const IntRect&,
                        ScrollbarPart) override;
   void paintButton(GraphicsContext&,
                    const Scrollbar&,
                    const IntRect&,
@@ skipping 11 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(ScrollbarThemeAuraTest, ButtonSizeVertical);
   FRIEND_TEST_ALL_PREFIXES(ScrollbarThemeAuraTest, NoButtonsReturnsSize0);
 
   virtual bool hasScrollbarButtons(ScrollbarOrientation) const;
   IntSize buttonSize(const ScrollbarThemeClient&);
 };
 
 }  // namespace blink
 
 #endif