[WIP] do something :-)

Source/core/css/CSSProperty.cpp

 /**
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006 Apple Computer, Inc.
  *
  * 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
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  * Library General Public License for more details.
  *
  * You should have received a copy of the GNU Library General Public License
  * along with this library; see the file COPYING.LIB.  If not, write to
  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  * Boston, MA 02110-1301, USA.
  */
 
 #include "config.h"
 #include "core/css/CSSProperty.h"
 
 #include "core/StylePropertyShorthand.h"
 #include "core/style/ComputedStyleConstants.h"
+#include "wtf/SizeAssertions.h"
 
 namespace blink {
 
-struct SameSizeAsCSSProperty {
-    uint32_t bitfields;
-    void* value;
-};
-
-static_assert(sizeof(CSSProperty) == sizeof(SameSizeAsCSSProperty), "CSSProperty should stay small");
+ASSERT_SIZE(CSSProperty, 8, 16);
 
 CSSPropertyID StylePropertyMetadata::shorthandID() const
 {
     if (!m_isSetFromShorthand)
         return CSSPropertyInvalid;
 
     Vector<StylePropertyShorthand, 4> shorthands;
     getMatchingShorthandsForLonghand(static_cast<CSSPropertyID>(m_propertyID), &shorthands);
     ASSERT(shorthands.size() && m_indexInShorthandsVector >= 0 && m_indexInShorthandsVector < shorthands.size());
     return shorthands.at(m_indexInShorthandsVector).id();
@@ skipping 219 matching lines @@
     // affected by all property.
     return propertyID != CSSPropertyUnicodeBidi && propertyID != CSSPropertyDirection;
 }
 
 bool CSSProperty::operator==(const CSSProperty& other) const
 {
     return m_value->equals(*other.m_value) && isImportant() == other.isImportant();
 }
 
 } // namespace blink