Do-not-commit: Count layout tree memory usage

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

 /*
  * Copyright (C) 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 39 matching lines @@
   // If you have a LayoutMedia, use firstChild or lastChild instead.
   void slowFirstChild() const = delete;
   void slowLastChild() const = delete;
 
   const LayoutObjectChildList* children() const { return &m_children; }
   LayoutObjectChildList* children() { return &m_children; }
 
   HTMLMediaElement* mediaElement() const;
 
   const char* name() const override { return "LayoutMedia"; }
+  char objectSize() const override { return sizeof(this); }
 
  protected:
   void layout() override;
 
   bool isOfType(LayoutObjectType type) const override {
     return type == LayoutObjectMedia || LayoutImage::isOfType(type);
   }
 
  private:
   LayoutObjectChildList* virtualChildren() final { return children(); }
@@ skipping 14 matching lines @@
   LayoutUnit computePanelWidth(const LayoutRect& mediaWidth) const;
 
   LayoutObjectChildList m_children;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutMedia, isMedia());
 
 }  // namespace blink
 
 #endif  // LayoutMedia_h