Move isValid/isCurrentColor from Color to StyleColor

Source/core/svg/SVGColor.h

Index: Source/core/svg/SVGColor.h
diff --git a/Source/core/svg/SVGColor.h b/Source/core/svg/SVGColor.h
index dd820fd1fef41f7cd4a8a55ca8e336bbd37db68b..3ea3d7ea4bc756b0431961c8c059ad3cb47a1a6b 100644
--- a/Source/core/svg/SVGColor.h
+++ b/Source/core/svg/SVGColor.h
@@ -42,7 +42,7 @@ public:
     static PassRefPtr<SVGColor> createFromString(const String& rgbColor)
     {
         RefPtr<SVGColor> color = adoptRef(new SVGColor(SVG_COLORTYPE_RGBCOLOR));
-        color->setColor(colorFromRGBColorString(rgbColor));
+        color->m_valid = colorFromRGBColorString(rgbColor, color->m_color);
         return color.release();
     }
 
@@ -62,7 +62,13 @@ public:
     const SVGColorType& colorType() const { return m_colorType; }
     PassRefPtr<RGBColor> rgbColor() const;
 
-    static Color colorFromRGBColorString(const String&);
+    static bool colorFromRGBColorString(const String&, Color&);
+    static Color colorFromRGBColorString(const String& s)
+    {
+        Color color;
+        colorFromRGBColorString(s, color);
+        return color;
+    }
 
     void setRGBColor(const String& rgbColor, ExceptionCode&);
     void setRGBColorICCColor(const String& rgbColor, const String& iccColor, ExceptionCode&);
@@ -82,7 +88,7 @@ protected:
     SVGColor(ClassType, const SVGColorType&);
     SVGColor(ClassType, const SVGColor& cloneFrom);
 
-    void setColor(const Color& color) { m_color = color; }
+    void setColor(const Color& color) { m_color = color; m_valid = true; }
     void setColorType(const SVGColorType& type) { m_colorType = type; }
 
 private:
@@ -90,6 +96,7 @@ private:
 
     Color m_color;
     SVGColorType m_colorType;
+    bool m_valid;
 };
 
 } // namespace WebCore