Make cssFloat an enumerable property of CSSStyleDeclaration

Source/core/css/PropertySetCSSStyleDeclaration.h

 /*
  * Copyright (C) 2012 Apple Inc. All rights reserved.
  *
  * 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 38 matching lines @@
 private:
     CSSRule* parentRule() const override { return 0; }
     unsigned length() const final;
     String item(unsigned index) const final;
     String getPropertyValue(const String& propertyName) final;
     String getPropertyPriority(const String& propertyName) final;
     String getPropertyShorthand(const String& propertyName) final;
     bool isPropertyImplicit(const String& propertyName) final;
     void setProperty(const String& propertyName, const String& value, const String& priority, ExceptionState&) final;
     String removeProperty(const String& propertyName, ExceptionState&) final;
+    String cssFloat() const;
+    void setCSSFloat(const String&, ExceptionState&);
     String cssText() const final;
     void setCSSText(const String&, ExceptionState&) final;
     PassRefPtrWillBeRawPtr<CSSValue> getPropertyCSSValueInternal(CSSPropertyID) final;
     String getPropertyValueInternal(CSSPropertyID) final;
     void setPropertyInternal(CSSPropertyID, const String& value, bool important, ExceptionState&) final;
 
     bool cssPropertyMatches(CSSPropertyID, const CSSValue*) const final;
 
 protected:
     enum MutationType { NoChanges, PropertyChanged };
@@ skipping 73 matching lines @@
     Element* parentElement() const override { return m_parentElement; }
 
     void didMutate(MutationType) override;
 
     RawPtrWillBeMember<Element> m_parentElement;
 };
 
 } // namespace blink
 
 #endif