Do-not-commit: Count layout tree memory usage

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

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef LayoutMultiColumnSpannerPlaceholder_h
 #define LayoutMultiColumnSpannerPlaceholder_h
 
 #include "core/layout/LayoutBlockFlow.h"
 
 namespace blink {
@@ skipping 30 matching lines @@
     // to make sure that we enter it.
     setChildNeedsLayout(MarkOnlyThis);
   }
 
   void layoutObjectInFlowThreadStyleDidChange(const ComputedStyle* oldStyle);
   void updateMarginProperties();
 
   const char* name() const override {
     return "LayoutMultiColumnSpannerPlaceholder";
   }
+  char objectSize() const override { return sizeof(this); }
 
  protected:
   void insertedIntoTree() override;
   void willBeRemovedFromTree() override;
   bool needsPreferredWidthsRecalculation() const override;
   LayoutUnit minPreferredLogicalWidth() const override;
   LayoutUnit maxPreferredLogicalWidth() const override;
   void layout() override;
   void computeLogicalHeight(LayoutUnit logicalHeight,
                             LayoutUnit logicalTop,
@@ skipping 10 matching lines @@
   // The actual column-span:all layoutObject inside the flow thread.
   LayoutBox* m_layoutObjectInFlowThread;
 };
 
 DEFINE_LAYOUT_OBJECT_TYPE_CASTS(LayoutMultiColumnSpannerPlaceholder,
                                 isLayoutMultiColumnSpannerPlaceholder());
 
 }  // namespace blink
 
 #endif