Added ASSERT_SIZE macro for checking size of size-sensitive classes

third_party/WebKit/Source/core/css/CSSValue.cpp

 /*
  * Copyright (C) 2011 Andreas Kling (kling@webkit.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 44 matching lines @@
 #include "core/css/CSSReflectValue.h"
 #include "core/css/CSSShadowValue.h"
 #include "core/css/CSSStringValue.h"
 #include "core/css/CSSTimingFunctionValue.h"
 #include "core/css/CSSURIValue.h"
 #include "core/css/CSSUnicodeRangeValue.h"
 #include "core/css/CSSUnsetValue.h"
 #include "core/css/CSSValueList.h"
 #include "core/css/CSSValuePair.h"
 #include "core/css/CSSVariableReferenceValue.h"
+#include "wtf/SizeAssertions.h"
 
 namespace blink {
 
-struct SameSizeAsCSSValue : public GarbageCollectedFinalized<SameSizeAsCSSValue> {
-    uint32_t bitfields;
-};
-
-static_assert(sizeof(CSSValue) <= sizeof(SameSizeAsCSSValue), "CSSValue should stay small");
+ASSERT_SIZE(CSSValue, 4, 8);
 
 bool CSSValue::isImplicitInitialValue() const
 {
     return m_classType == InitialClass && toCSSInitialValue(this)->isImplicit();
 }
 
 bool CSSValue::hasFailedOrCanceledSubresources() const
 {
     if (isValueList())
         return toCSSValueList(this)->hasFailedOrCanceledSubresources();
@@ skipping 582 matching lines @@
         toCSSCustomPropertyDeclaration(this)->traceAfterDispatch(visitor);
         return;
     case PendingSubstitutionValueClass:
         toCSSPendingSubstitutionValue(this)->traceAfterDispatch(visitor);
         return;
     }
     ASSERT_NOT_REACHED();
 }
 
 } // namespace blink