[Variables] Enable get/setProperty and similar APIs from the CSSOM

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

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2008, 2012 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 35 matching lines @@
     virtual void deref() = 0;
 #endif
 
     virtual CSSRule* parentRule() const = 0;
     String cssFloat()
     {
         return getPropertyValueInternal(CSSPropertyFloat);
     }
     void setCSSFloat(const String& value, ExceptionState& exceptionState)
     {
-        setPropertyInternal(CSSPropertyFloat, value, false, exceptionState);
+        setPropertyInternal(CSSPropertyFloat, String(), value, false, exceptionState);
     }
     virtual String cssText() const = 0;
     virtual void setCSSText(const String&, ExceptionState&) = 0;
     virtual unsigned length() const = 0;
     virtual String item(unsigned index) const = 0;
     virtual String getPropertyValue(const String& propertyName) = 0;
     virtual String getPropertyPriority(const String& propertyName) = 0;
     virtual String getPropertyShorthand(const String& propertyName) = 0;
     virtual bool isPropertyImplicit(const String& propertyName) = 0;
     virtual void setProperty(const String& propertyName, const String& value, const String& priority, ExceptionState&) = 0;
     virtual String removeProperty(const String& propertyName, ExceptionState&) = 0;
 
     // CSSPropertyID versions of the CSSOM functions to support bindings and editing.
     // Use the non-virtual methods in the concrete subclasses when possible.
     // The CSSValue returned by this function should not be exposed to the web as it may be used by multiple documents at the same time.
     virtual PassRefPtrWillBeRawPtr<CSSValue> getPropertyCSSValueInternal(CSSPropertyID) = 0;
     virtual String getPropertyValueInternal(CSSPropertyID) = 0;
-    virtual void setPropertyInternal(CSSPropertyID, const String& value, bool important, ExceptionState&) = 0;
+    virtual void setPropertyInternal(CSSPropertyID, const String& propertyValue, const String& value, bool important, ExceptionState&) = 0;
 
     virtual bool cssPropertyMatches(CSSPropertyID, const CSSValue*) const = 0;
     virtual CSSStyleSheet* parentStyleSheet() const { return 0; }
 
     DEFINE_INLINE_VIRTUAL_TRACE() { }
 
 protected:
     CSSStyleDeclaration() { }
 };
 
 } // namespace blink
 
 #endif // CSSStyleDeclaration_h