Do-not-commit: Count layout tree memory usage

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

 /*
  * Copyright (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * 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,
@@ skipping 58 matching lines @@
 
   const char* name() const override { return "LayoutCounter"; }
 
  protected:
   void willBeDestroyed() override;
 
  private:
   bool isOfType(LayoutObjectType type) const override {
     return type == LayoutObjectCounter || LayoutText::isOfType(type);
   }
+
+  char objectSize() const override { return sizeof(this); }
+
   PassRefPtr<StringImpl> originalText() const override;
 
   // Removes the reference to the CounterNode associated with this layoutObject.
   // This is used to cause a counter display update when the CounterNode tree
   // changes.
   void invalidate();
 
   CounterContent m_counter;
   CounterNode* m_counterNode;
   LayoutCounter* m_nextForSameCounter;
   friend class CounterNode;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutCounter, isCounter());
 
 }  // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 void showCounterLayoutTree(const blink::LayoutObject*,
                            const char* counterName = nullptr);
 #endif
 
 #endif  // LayoutCounter_h