Do-not-commit: Count layout tree memory usage

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

 /*
  * Copyright (C) 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.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 20 matching lines @@
 class LayoutSlider final : public LayoutFlexibleBox {
  public:
   static const int defaultTrackLength;
 
   explicit LayoutSlider(HTMLInputElement*);
   ~LayoutSlider() override;
 
   bool inDragMode() const;
 
   const char* name() const override { return "LayoutSlider"; }
+  char objectSize() const override { return sizeof(this); }
 
  private:
   bool isOfType(LayoutObjectType type) const override {
     return type == LayoutObjectSlider || LayoutFlexibleBox::isOfType(type);
   }
 
   int baselinePosition(
       FontBaseline,
       bool firstLine,
       LineDirectionMode,
       LinePositionMode = PositionOnContainingLine) const override;
   void computeIntrinsicLogicalWidths(
       LayoutUnit& minLogicalWidth,
       LayoutUnit& maxLogicalWidth) const override;
   void layout() override;
 
   SliderThumbElement* sliderThumbElement() const;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutSlider, isSlider());
 
 }  // namespace blink
 
 #endif  // LayoutSlider_h