[WIP] do something :-)

Source/core/layout/line/RootInlineBox.cpp

 /*
  * Copyright (C) 2003, 2006, 2008 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 16 matching lines @@
 #include "core/layout/LayoutInline.h"
 #include "core/layout/LayoutView.h"
 #include "core/layout/VerticalPositionCache.h"
 #include "core/layout/api/LineLayoutItem.h"
 #include "core/layout/line/EllipsisBox.h"
 #include "core/layout/line/GlyphOverflow.h"
 #include "core/layout/line/InlineTextBox.h"
 #include "core/paint/PaintInfo.h"
 #include "core/paint/RootInlineBoxPainter.h"
 #include "platform/text/BidiResolver.h"
+#include "wtf/SizeAssertions.h"
 #include "wtf/text/Unicode.h"
 
 namespace blink {
 
-struct SameSizeAsRootInlineBox : public InlineFlowBox {
-    unsigned unsignedVariable;
-    void* pointers[3];
-    LayoutUnit layoutVariables[6];
-};
-
-static_assert(sizeof(RootInlineBox) == sizeof(SameSizeAsRootInlineBox), "RootInlineBox should stay small");
+ASSERT_SIZE(RootInlineBox, sizeof(InlineFlowBox) + 40, sizeof(InlineFlowBox) + 48);
 
 typedef WTF::HashMap<const RootInlineBox*, EllipsisBox*> EllipsisBoxMap;
 static EllipsisBoxMap* gEllipsisBoxMap = nullptr;
 
 RootInlineBox::RootInlineBox(LayoutBlockFlow& block)
     : InlineFlowBox(block)
     , m_lineBreakPos(0)
     , m_lineBreakObj(nullptr)
     , m_lineTop(0)
     , m_lineBottom(0)
@@ skipping 790 matching lines @@
     endBox = nullptr;
     return nullptr;
 }
 
 const char* RootInlineBox::boxName() const
 {
     return "RootInlineBox";
 }
 
 } // namespace blink