Do-not-commit: Count layout tree memory usage

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

 /*
  * Copyright (C) 2000 Lars Knoll (knoll@kde.org)
  *
  * 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 45 matching lines @@
               FloatRect* /* glyphBounds */ = nullptr) const override {
     return 0;
   }
 
   int lineHeight(bool firstLine) const;
 
   bool isOfType(LayoutObjectType type) const override {
     return type == LayoutObjectBr || LayoutText::isOfType(type);
   }
 
+  char objectSize() const override { return sizeof(this); }
+
   int caretMinOffset() const override;
   int caretMaxOffset() const override;
 
   PositionWithAffinity positionForPoint(const LayoutPoint&) final;
 
  protected:
   void styleDidChange(StyleDifference, const ComputedStyle* oldStyle) override;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutBR, isBR());
 
 }  // namespace blink
 
 #endif  // LayoutBR_h