Do-not-commit: Count layout tree memory usage

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

 /*
  * Copyright (C) 2006 Oliver Hunt <ojh16@student.canterbury.ac.nz>
  * Copyright (C) 2006, 2008 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Rob Buis <buis@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.
  *
@@ skipping 54 matching lines @@
 
   FloatRect objectBoundingBox() const override {
     return floatLinesBoundingBox();
   }
 
   bool isOfType(LayoutObjectType type) const override {
     return type == LayoutObjectSVG || type == LayoutObjectSVGInlineText ||
            LayoutText::isOfType(type);
   }
 
+  char objectSize() const override { return sizeof(this); }
+  char approximateHeapMemoryUsage() const override {
+    int memory = LayoutText::approximateHeapMemoryUsage();
+    // TODO(pdr): Also add memory from m_characterDataMap.
+    // TODO(pdr): Also add memory from m_metrics.
+    return memory;
+  }
+
   PositionWithAffinity positionForPoint(const LayoutPoint&) override;
   LayoutRect localCaretRect(
       InlineBox*,
       int caretOffset,
       LayoutUnit* extraWidthToEndOfLine = nullptr) override;
   LayoutRect linesBoundingBox() const override;
   InlineTextBox* createTextBox(int start, unsigned short length) override;
 
   LayoutRect absoluteVisualRect() const final;
   FloatRect visualRectInLocalSVGCoordinates() const final;
 
   float m_scalingFactor;
   Font m_scaledFont;
   SVGCharacterDataMap m_characterDataMap;
   Vector<SVGTextMetrics> m_metrics;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutSVGInlineText, isSVGInlineText());
 
 }  // namespace blink
 
 #endif  // LayoutSVGInlineText_h