Move isValid/isCurrentColor from Color to StyleColor

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 2eee153f8ac548e25cbddfa91f82d16a345d7390..1f2a35fad5209caa3baf78e4472b4b7dbb9121fe 100644
--- a/Source/core/css/CSSComputedStyleDeclaration.h
+++ b/Source/core/css/CSSComputedStyleDeclaration.h
@@ -22,6 +22,7 @@
 #define CSSComputedStyleDeclaration_h
 
 #include "core/css/CSSStyleDeclaration.h"
+#include "core/css/StyleColor.h"
 #include "core/rendering/style/RenderStyleConstants.h"
 #include "wtf/HashMap.h"
 #include "wtf/RefPtr.h"
@@ -109,8 +110,9 @@ private:
 
     virtual bool cssPropertyMatches(CSSPropertyID, const CSSValue*) const OVERRIDE;
 
-    PassRefPtr<CSSValue> valueForShadow(const ShadowData*, CSSPropertyID, const RenderStyle*) const;
-    PassRefPtr<CSSPrimitiveValue> currentColorOrValidColor(RenderStyle*, const Color&) const;
+    PassRefPtr<CSSValue> valueForShadow(const RenderObject*, const ShadowData*, CSSPropertyID, const RenderStyle*) const;
+    PassRefPtr<CSSPrimitiveValue> currentColorOrValidColor(RenderStyle*, const StyleColor&) const;
+    PassRefPtr<CSSPrimitiveValue> currentColorOrValidColor(const RenderObject*, const RenderStyle*, int colorProperty) const;
     PassRefPtr<SVGPaint> adjustSVGPaintForCurrentColor(PassRefPtr<SVGPaint>, RenderStyle*) const;
 
     PassRefPtr<CSSValue> valueForFilter(const RenderObject*, const RenderStyle*) const;