Partial implementation of CSSVariablesMap for CSS Variables CSSOM

Source/core/css/PropertySetCSSStyleDeclaration.h

Index: Source/core/css/PropertySetCSSStyleDeclaration.h
diff --git a/Source/core/css/PropertySetCSSStyleDeclaration.h b/Source/core/css/PropertySetCSSStyleDeclaration.h
index 96fabbe05d3b82fa0989a50acb1ddec60b85c731..7c4770befba0fb3fc96aab9403c7bb3ea9acce36 100644
--- a/Source/core/css/PropertySetCSSStyleDeclaration.h
+++ b/Source/core/css/PropertySetCSSStyleDeclaration.h
@@ -27,6 +27,7 @@
 #define PropertySetCSSStyleDeclaration_h
 
 #include "core/css/CSSStyleDeclaration.h"
+#include "core/css/CSSVariablesMap.h"
 #include <wtf/HashMap.h>
 
 namespace WebCore {
@@ -67,7 +68,14 @@ private:
     virtual PassRefPtr<CSSValue> getPropertyCSSValueInternal(CSSPropertyID) OVERRIDE;
     virtual String getPropertyValueInternal(CSSPropertyID) OVERRIDE;
     virtual void setPropertyInternal(CSSPropertyID, const String& value, bool important, ExceptionCode&) OVERRIDE;
-    
+
+    virtual PassRefPtr<CSSVariablesMap> var() OVERRIDE { return CSSVariablesMap::create(this); }
+    virtual unsigned variableCount() const OVERRIDE;
+    virtual String variableValue(const AtomicString& name) const OVERRIDE;
+    virtual void setVariableValue(const AtomicString& name, const String& value, ExceptionCode&) OVERRIDE;
+    virtual bool removeVariable(const AtomicString& name) OVERRIDE;
+    virtual void clearVariables(ExceptionCode&) OVERRIDE;
+
     virtual bool cssPropertyMatches(CSSPropertyID, const CSSValue*) const OVERRIDE;
     virtual PassRefPtr<MutableStylePropertySet> copyProperties() const OVERRIDE;