Do-not-commit: Count layout tree memory usage

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

 /*
  * Copyright (C) 1997 Martin Jones (mjones@kde.org)
  *           (C) 1997 Torben Weis (weis@kde.org)
  *           (C) 1998 Waldo Bastian (bastian@kde.org)
  *           (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2003, 2004, 2005, 2006, 2007, 2009, 2013 Apple Inc.
  *               All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 70 matching lines @@
 // (see 'border-collapse').
 // Also there is no margin on table cell (or any internal table element).
 //
 // LayoutTableCell is positioned with respect to the enclosing
 // LayoutTableSection. See callers of
 // LayoutTableSection::setLogicalPositionForCell() for when it is placed.
 class CORE_EXPORT LayoutTableCell final : public LayoutBlockFlow {
  public:
   explicit LayoutTableCell(Element*);
 
+  char objectSize() const override { return sizeof(this); }
+  char approximateHeapMemoryUsage() const override {
+    int memory = LayoutBlockFlow::approximateHeapMemoryUsage();
+    if (m_collapsedBorderValues)
+      memory += sizeof(CollapsedBorderValues);
+    if (m_rowBackgroundDisplayItemClient)
+      memory += sizeof(RowBackgroundDisplayItemClient);
+    return memory;
+  }
+
   unsigned colSpan() const {
     if (!m_hasColSpan)
       return 1;
     return parseColSpanFromDOM();
   }
   unsigned rowSpan() const {
     if (!m_hasRowSpan)
       return 1;
     return parseRowSpanFromDOM();
   }
@@ skipping 370 matching lines @@
   return toLayoutTableCell(firstChild());
 }
 
 inline LayoutTableCell* LayoutTableRow::lastCell() const {
   return toLayoutTableCell(lastChild());
 }
 
 }  // namespace blink
 
 #endif  // LayoutTableCell_h