Do-not-commit: Count layout tree memory usage

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 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.
@@ skipping 221 matching lines @@
 
  private:
   LayoutObjectChildList* virtualChildren() final { return children(); }
   const LayoutObjectChildList* virtualChildren() const final {
     return children();
   }
   const LayoutObjectChildList* children() const { return &m_children; }
   LayoutObjectChildList* children() { return &m_children; }
 
   bool isLayoutInline() const final { return true; }
+  char objectSize() const override { return sizeof(this); }
+  char approximateHeapMemoryUsage() const override {
+    int memory = LayoutBoxModelObject::approximateHeapMemoryUsage();
+    // TODO(pdr): Include the line box list (m_lineBoxes) memory.
+    return memory;
+  }
 
   LayoutRect culledInlineVisualOverflowBoundingBox() const;
   InlineBox* culledInlineFirstLineBox() const;
   InlineBox* culledInlineLastLineBox() const;
 
   // For visualOverflowRect() only, to get bounding box of visual overflow of
   // line boxes.
   LayoutRect linesVisualOverflowBoundingBox() const;
 
   template <typename GeneratorContext>
@@ skipping 94 matching lines @@
   // All of the line boxes created for this inline flow. For example,
   // <i>Hello<br>world.</i> will have two <i> line boxes.
   LineBoxList m_lineBoxes;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutInline, isLayoutInline());
 
 }  // namespace blink
 
 #endif  // LayoutInline_h