Do-not-commit: Count layout tree memory usage

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

 /*
  * Copyright (C) 2008 Torch Mobile Inc. All rights reserved.
  *               (http://www.torchmobile.com/)
  * Copyright (C) 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 21 matching lines @@
 class LayoutTextControlMultiLine final : public LayoutTextControl {
  public:
   LayoutTextControlMultiLine(HTMLTextAreaElement*);
   ~LayoutTextControlMultiLine() override;
 
  private:
   bool isOfType(LayoutObjectType type) const override {
     return type == LayoutObjectTextArea || LayoutTextControl::isOfType(type);
   }
 
+  char objectSize() const override { return sizeof(this); }
+
   bool nodeAtPoint(HitTestResult&,
                    const HitTestLocation& locationInContainer,
                    const LayoutPoint& accumulatedOffset,
                    HitTestAction) override;
 
   float getAvgCharWidth(const AtomicString& family) const override;
   LayoutUnit preferredContentLogicalWidth(float charWidth) const override;
   LayoutUnit computeControlLogicalHeight(
       LayoutUnit lineHeight,
       LayoutUnit nonContentHeight) const override;
@@ skipping 10 matching lines @@
       const ComputedStyle& startStyle) const override;
   LayoutObject* layoutSpecialExcludedChild(bool relayoutChildren,
                                            SubtreeLayoutScope&) override;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutTextControlMultiLine, isTextArea());
 
 }  // namespace blink
 
 #endif