Do-not-commit: Count layout tree memory usage

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

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2006 Apple Computer, Inc.
  *
  * 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 57 matching lines @@
   bool hitTest(HitTestResult&);
   bool hitTestNoLifecycleUpdate(HitTestResult&);
 
   // Returns the total count of calls to HitTest, for testing.
   unsigned hitTestCount() const { return m_hitTestCount; }
   unsigned hitTestCacheHits() const { return m_hitTestCacheHits; }
 
   void clearHitTestCache();
 
   const char* name() const override { return "LayoutView"; }
+  char objectSize() const override { return sizeof(this); }
+  char approximateHeapMemoryUsage() const override {
+    int memory = LayoutBlockFlow::approximateHeapMemoryUsage();
+    // TODO(pdr): Include additional heap memory.
+    return memory;
+  }
 
   bool isOfType(LayoutObjectType type) const override {
     return type == LayoutObjectLayoutView || LayoutBlockFlow::isOfType(type);
   }
 
   PaintLayerType layerTypeRequired() const override { return NormalPaintLayer; }
 
   bool isChildAllowed(LayoutObject*, const ComputedStyle&) const override;
 
   void layout() override;
@@ skipping 237 matching lines @@
   unsigned m_hitTestCount;
   unsigned m_hitTestCacheHits;
   Persistent<HitTestCache> m_hitTestCache;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutView, isLayoutView());
 
 }  // namespace blink
 
 #endif  // LayoutView_h