Do-not-commit: Count layout tree memory usage

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

 /*
  * Copyright (C) 2011 Adobe Systems Incorporated. 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.
@@ skipping 53 matching lines @@
 // LayoutMultiColumnSet will actually be a viewPort of the LayoutFlowThread.
 class CORE_EXPORT LayoutFlowThread : public LayoutBlockFlow {
  public:
   LayoutFlowThread();
   ~LayoutFlowThread() override {}
 
   bool isLayoutFlowThread() const final { return true; }
   virtual bool isLayoutMultiColumnFlowThread() const { return false; }
   virtual bool isLayoutPagedFlowThread() const { return false; }
 
+  char objectSize() const override { return sizeof(this); }
+
   // Search mode when looking for an enclosing fragmentation context.
   enum AncestorSearchConstraint {
     // No constraints. When we're not laying out (but rather e.g. painting or
     // hit-testing), we just want to find all enclosing fragmentation contexts,
     // e.g. to calculate the accumulated visual translation.
     AnyAncestor,
 
     // Consider fragmentation contexts that are strictly unbreakable (seen from
     // the outside) to be isolated from the rest, so that such fragmentation
     // contexts don't participate in fragmentation of enclosing fragmentation
@@ skipping 136 matching lines @@
 struct ValueToString<LayoutMultiColumnSet*> {
   static String toString(const LayoutMultiColumnSet* value) {
     return String::format("%p", value);
   }
 };
 #endif
 
 }  // namespace blink
 
 #endif  // LayoutFlowThread_h