Do-not-commit: Count layout tree memory usage

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2007 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010 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
@@ skipping 211 matching lines @@
       EDisplay = EDisplay::kBlock);
   LayoutBlock* createAnonymousBlock(EDisplay display = EDisplay::kBlock) const {
     return createAnonymousWithParentAndDisplay(this, display);
   }
 
   LayoutBox* createAnonymousBoxWithSameTypeAs(
       const LayoutObject* parent) const override;
 
   int columnGap() const;
 
+  char objectSize() const override { return sizeof(this); }
+
   // Accessors for logical width/height and margins in the containing block's
   // block-flow direction.
   LayoutUnit logicalWidthForChild(const LayoutBox& child) const {
     return logicalWidthForChildSize(child.size());
   }
   LayoutUnit logicalWidthForChildSize(LayoutSize childSize) const {
     return isHorizontalWritingMode() ? childSize.width() : childSize.height();
   }
   LayoutUnit logicalHeightForChild(const LayoutBox& child) const {
     return isHorizontalWritingMode() ? child.size().height()
@@ skipping 322 matching lines @@
   // TODO(lunalu): Temporary in order to ensure compatibility with existing
   // layout test results.
   virtual void adjustChildDebugRect(LayoutRect&) const {}
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutBlock, isLayoutBlock());
 
 }  // namespace blink
 
 #endif  // LayoutBlock_h