Do-not-commit: Count layout tree memory usage

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

 /*
  * Copyright (C) 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Google 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.
@@ skipping 21 matching lines @@
 #include "platform/geometry/IntSize.h"
 
 namespace blink {
 
 class Element;
 class LayoutVideo;
 
 class LayoutTextTrackContainer final : public LayoutBlockFlow {
  public:
   LayoutTextTrackContainer(Element*);
+  char objectSize() const override { return sizeof(this); }
 
  private:
   void layout() override;
 
   bool updateSizes(const LayoutVideo&);
 
   float m_fontSize;
 };
 
 }  // namespace blink
 
 #endif  // LayoutTextTrackContainer_h