Do-not-commit: Count layout tree memory usage

third_party/WebKit/Source/core/layout/LayoutPart.h

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2000 Simon Hausmann <hausmann@kde.org>
  * Copyright (C) 2006, 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 42 matching lines @@
   LayoutRect replacedContentRect() const final;
 
   void updateOnWidgetChange();
   void updateGeometry();
 
   bool isLayoutPart() const final { return true; }
   virtual void paintContents(const PaintInfo&, const LayoutPoint&) const;
 
   bool isThrottledFrameView() const;
 
+  char objectSize() const override { return sizeof(this); }
+
  protected:
   PaintLayerType layerTypeRequired() const override;
 
   void styleDidChange(StyleDifference, const ComputedStyle* oldStyle) final;
   void layout() override;
   void paint(const PaintInfo&, const LayoutPoint&) const override;
   CursorDirective getCursor(const LayoutPoint&, Cursor&) const final;
 
   // Overridden to invalidate the child frame if any.
   void invalidatePaintOfSubtreesIfNeeded(
@@ skipping 12 matching lines @@
                                     HitTestAction);
 
   int m_refCount;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutPart, isLayoutPart());
 
 }  // namespace blink
 
 #endif  // LayoutPart_h