add Tickmarks to aura overlay scrollbar

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

 /*
  * Copyright (C) 2011 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
@@ skipping 11 matching lines @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "platform/scroll/ScrollbarThemeOverlay.h"
 
 #include "platform/PlatformMouseEvent.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/paint/DrawingRecorder.h"
 #include "platform/scroll/Scrollbar.h"
+#include "platform/scroll/ScrollbarThemeAura.h"

[bokan, 2016/11/07 16:57:39]

This is unneeded?

 #include "platform/transforms/TransformationMatrix.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebRect.h"
 #include "public/platform/WebThemeEngine.h"
 #include "wtf/MathExtras.h"
 
 #include <algorithm>
 
 namespace blink {
 
@@ skipping 165 matching lines @@
       Platform::current()->themeEngine()->getOverlayScrollbarStyle(&style);
     }
     theme = new ScrollbarThemeOverlay(
         style.thumbThickness, style.scrollbarMargin,
         ScrollbarThemeOverlay::DisallowHitTest, Color(style.color));
   }
   return *theme;
 }
 
 }  // namespace blink