Removed parent data storage common to multiple CSSValues

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

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 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,
@@ skipping 168 matching lines @@
     static const size_t ValueListSeparatorBits = 2;
     enum ValueListSeparator {
         SpaceSeparator,
         CommaSeparator,
         SlashSeparator
     };
 
     ClassType getClassType() const { return static_cast<ClassType>(m_classType); }
 
     explicit CSSValue(ClassType classType)
-        : m_primitiveUnitType(0)
-        , m_hasCachedCSSText(false)
-        , m_valueListSeparator(SpaceSeparator)
-        , m_classType(classType)
+        : m_classType(classType)
     {
     }
 
     // NOTE: This class is non-virtual for memory and performance reasons.
     // Don't go making it virtual again unless you know exactly what you're doing!
 
 private:
     void destroy();
 
-protected:
-    // The bits in this section are only used by specific subclasses but kept here
-    // to maximize struct packing.
-
-    // CSSPrimitiveValue bits:
-    unsigned m_primitiveUnitType : 7; // CSSPrimitiveValue::UnitType
-    mutable unsigned m_hasCachedCSSText : 1;
-
-    unsigned m_valueListSeparator : ValueListSeparatorBits;

[esprehn, 2016/08/11 05:42:35]

this was done so these bits can pack with m_classType

-
-private:
     unsigned m_classType : ClassTypeBits; // ClassType
 };
 
 template<typename CSSValueType, size_t inlineCapacity>
 inline bool compareCSSValueVector(const HeapVector<Member<CSSValueType>, inlineCapacity>& firstVector, const HeapVector<Member<CSSValueType>, inlineCapacity>& secondVector)
 {
     size_t size = firstVector.size();
     if (size != secondVector.size())
         return false;
 
@@ skipping 36 matching lines @@
         return false;
     return first->equals(*second);
 }
 
 #define DEFINE_CSS_VALUE_TYPE_CASTS(thisType, predicate) \
     DEFINE_TYPE_CASTS(thisType, CSSValue, value, value->predicate, value.predicate)
 
 } // namespace blink
 
 #endif // CSSValue_h