Do-not-commit: Count layout tree memory usage

third_party/WebKit/Source/core/layout/LayoutObject.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2000 Dirk Mueller (mueller@kde.org)
  *           (C) 2004 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2011 Apple Inc.
  *               All rights reserved.
  * Copyright (C) 2009 Google Inc. All rights reserved.
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved.
  *               (http://www.torchmobile.com/)
@@ skipping 239 matching lines @@
 }
 
 bool LayoutObject::isHR() const {
   return isHTMLHRElement(node());
 }
 
 bool LayoutObject::isLegend() const {
   return isHTMLLegendElement(node());
 }
 
+char LayoutObject::approximateHeapMemoryUsage() const {
+  int memory = 0;
+  if (m_style)
+    memory += sizeof(ComputedStyle);
+  if (m_paintProperties) {
+    memory += sizeof(ObjectPaintProperties);
+    memory += m_paintProperties->heapMemoryUsage();
+  }
+  return memory;
+}
+
 void LayoutObject::setIsInsideFlowThreadIncludingDescendants(
     bool insideFlowThread) {
   LayoutObject* next;
   for (LayoutObject* object = this; object; object = next) {
     // If object is a fragmentation context it already updated the descendants
     // flag accordingly.
     if (object->isLayoutFlowThread()) {
       next = object->nextInPreOrderAfterChildren(this);
       continue;
     }
@@ skipping 3356 matching lines @@
     const blink::LayoutObject* root = object1;
     while (root->parent())
       root = root->parent();
     root->showLayoutTreeAndMark(object1, "*", object2, "-", 0);
   } else {
     WTFLogAlways("%s", "Cannot showLayoutTree. Root is (nil)");
   }
 }
 
 #endif