Partial implementation of CSSVariablesMap for CSS Variables CSSOM

Source/core/css/CSSComputedStyleDeclaration.h

Index: Source/core/css/CSSComputedStyleDeclaration.h
diff --git a/Source/core/css/CSSComputedStyleDeclaration.h b/Source/core/css/CSSComputedStyleDeclaration.h
index e628cd8f304f84047f7cade85c86ba8626fbeb68..4f8173fabed9760d40afe0b3765803af253e5d1c 100644
--- a/Source/core/css/CSSComputedStyleDeclaration.h
+++ b/Source/core/css/CSSComputedStyleDeclaration.h
@@ -22,9 +22,13 @@
 #define CSSComputedStyleDeclaration_h
 
 #include "core/css/CSSStyleDeclaration.h"
+#include "core/css/CSSVariablesMap.h"
 #include "core/rendering/style/RenderStyleConstants.h"
-#include <wtf/RefPtr.h>
-#include <wtf/text/WTFString.h>
+#include "wtf/HashMap.h"
+#include "wtf/RefPtr.h"
+#include "wtf/text/AtomicString.h"
+#include "wtf/text/AtomicStringHash.h"
+#include "wtf/text/WTFString.h"
 
 namespace WebCore {
 
@@ -99,6 +103,14 @@ private:
     virtual String getPropertyValueInternal(CSSPropertyID);
     virtual void setPropertyInternal(CSSPropertyID, const String& value, bool important, ExceptionCode&);
 
+    virtual PassRefPtr<CSSVariablesMap> var() OVERRIDE { return CSSVariablesMap::create(this); }
+    const HashMap<AtomicString, String>* variableMap() const;
+    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;
 
     PassRefPtr<CSSValue> valueForShadow(const ShadowData*, CSSPropertyID, const RenderStyle*) const;