Do-not-commit: Count layout tree memory usage

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

 /*
  * Copyright (C) 2012 Apple Inc.  All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 132 matching lines @@
 class CORE_EXPORT LayoutMultiColumnFlowThread : public LayoutFlowThread,
                                                 public FragmentationContext {
  public:
   ~LayoutMultiColumnFlowThread() override;
 
   static LayoutMultiColumnFlowThread* createAnonymous(
       Document&,
       const ComputedStyle& parentStyle);
 
   bool isLayoutMultiColumnFlowThread() const final { return true; }
+  char objectSize() const override { return sizeof(this); }
 
   LayoutBlockFlow* multiColumnBlockFlow() const {
     return toLayoutBlockFlow(parent());
   }
 
   LayoutMultiColumnSet* firstMultiColumnSet() const;
   LayoutMultiColumnSet* lastMultiColumnSet() const;
 
   // Return the first column set or spanner placeholder.
   LayoutBox* firstMultiColumnBox() const { return nextSiblingBox(); }
@@ skipping 208 matching lines @@
 // LayoutObject.
 DEFINE_TYPE_CASTS(LayoutMultiColumnFlowThread,
                   LayoutFlowThread,
                   object,
                   object->isLayoutMultiColumnFlowThread(),
                   object.isLayoutMultiColumnFlowThread());
 
 }  // namespace blink
 
 #endif  // LayoutMultiColumnFlowThread_h