Do-not-commit: Count layout tree memory usage

third_party/WebKit/Source/core/layout/svg/LayoutSVGRoot.h

 /*
  * Copyright (C) 2004, 2005, 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2004, 2005, 2007 Rob Buis <buis@kde.org>
  * Copyright (C) 2009 Google, Inc.  All rights reserved.
  * Copyright (C) 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 78 matching lines @@
 
   LayoutRect visualOverflowRect() const override;
   LayoutRect overflowClipRect(
       const LayoutPoint& location,
       OverlayScrollbarClipBehavior =
           IgnorePlatformOverlayScrollbarSize) const override;
 
   bool hasNonIsolatedBlendingDescendants() const final;
 
   const char* name() const override { return "LayoutSVGRoot"; }
+  char objectSize() const override { return sizeof(this); }
 
  private:
   const LayoutObjectChildList* children() const { return &m_children; }
   LayoutObjectChildList* children() { return &m_children; }
 
   LayoutObjectChildList* virtualChildren() override { return children(); }
   const LayoutObjectChildList* virtualChildren() const override {
     return children();
   }
 
@@ skipping 70 matching lines @@
   bool m_hasBoxDecorationBackground : 1;
   mutable bool m_hasNonIsolatedBlendingDescendants : 1;
   mutable bool m_hasNonIsolatedBlendingDescendantsDirty : 1;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutSVGRoot, isSVGRoot());
 
 }  // namespace blink
 
 #endif  // LayoutSVGRoot_h