Invalidate paint of tickmarks on document change

Source/core/frame/FrameView.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 2210 matching lines @@
     m_scrollPosition = newPosition;
 
     if (!scrollbarsSuppressed())
         m_pendingScrollDelta += scrollDelta;
 
     updateLayersAndCompositingAfterScrollIfNeeded();
     scrollPositionChanged();
     frame().loader().client()->didChangeScrollOffset();
 }
 
+void FrameView::invalidatePaintForTickmarks() const
+{
+    if (Scrollbar* scrollbar = verticalScrollbar())
+        scrollbar->invalidate();
+}
+
 void FrameView::invalidateScrollbarRect(Scrollbar* scrollbar, const IntRect& rect)
 {
     // Add in our offset within the FrameView.
     IntRect dirtyRect = rect;
     dirtyRect.moveBy(scrollbar->location());
 
     layoutView()->invalidateDisplayItemClient(*scrollbar);
 
     if (isInPerformLayout())
         addScrollbarDamage(scrollbar, rect);
@@ skipping 1822 matching lines @@
 {
     Settings* settings = frame().settings();
     if (!settings || !settings->rootLayerScrolls())
         return this;
 
     LayoutView* layoutView = this->layoutView();
     return layoutView ? layoutView->scrollableArea() : nullptr;
 }
 
 } // namespace blink