Subtree caching implementation in blink-core

Source/core/layout/LayoutInline.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
@@ skipping 94 matching lines @@
 
     const char* name() const override { return "LayoutInline"; }
 
 protected:
     void willBeDestroyed() override;
 
     void styleDidChange(StyleDifference, const ComputedStyle* oldStyle) override;
 
     void computeSelfHitTestRects(Vector<LayoutRect>& rects, const LayoutPoint& layerOffset) const override;
 
-    void invalidateDisplayItemClients(const LayoutBoxModelObject& paintInvalidationContainer) const override;
+    void invalidateDisplayItemClients(const LayoutBoxModelObject& paintInvalidationContainer) override;
 
 private:
     LayoutObjectChildList* virtualChildren() final { return children(); }
     const LayoutObjectChildList* virtualChildren() const final { return children(); }
     const LayoutObjectChildList* children() const { return &m_children; }
     LayoutObjectChildList* children() { return &m_children; }
 
     bool isLayoutInline() const final { return true; }
 
     LayoutRect culledInlineVisualOverflowBoundingBox() const;
@@ skipping 70 matching lines @@
 
     LayoutObjectChildList m_children;
     LineBoxList m_lineBoxes; // All of the line boxes created for this inline flow.  For example, <i>Hello<br>world.</i> will have two <i> line boxes.
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutInline, isLayoutInline());
 
 } // namespace blink
 
 #endif // LayoutInline_h