Do-not-commit: Count layout tree memory usage

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

 /*
  * Copyright (C) 2012 Victor Carbune (victor@rosedu.org)
  *
  * 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 22 matching lines @@
 class IntRect;
 
 class LayoutVTTCue final : public LayoutBlockFlow {
  public:
   LayoutVTTCue(ContainerNode*, float snapToLinesPosition);
 
   // The computed line position for snap-to-lines layout, and NaN for
   // non-snap-to-lines layout where no adjustment should take place.
   float snapToLinesPosition() { return m_snapToLinesPosition; }
 
+  char objectSize() const override { return sizeof(this); }
+
  private:
   void layout() override;
 
   IntRect computeControlsRect() const;
   void repositionCueSnapToLinesNotSet();
 
   float m_snapToLinesPosition;
 };
 
 }  // namespace blink
 
 #endif  // LayoutVTTCue_h