Move isValid/isCurrentColor from Color to StyleColor

Source/core/svg/SVGColor.cpp

Index: Source/core/svg/SVGColor.cpp
diff --git a/Source/core/svg/SVGColor.cpp b/Source/core/svg/SVGColor.cpp
index 9d244c2c6740385eb0b8a33f9d379479dda89ef0..71782e964616e8241c815f677bc2356205cd3c1c 100644
--- a/Source/core/svg/SVGColor.cpp
+++ b/Source/core/svg/SVGColor.cpp
@@ -31,12 +31,14 @@ namespace WebCore {
 SVGColor::SVGColor(const SVGColorType& colorType)
     : CSSValue(SVGColorClass)
     , m_colorType(colorType)
+    , m_valid(false)
 {
 }
 
 SVGColor::SVGColor(ClassType classType, const SVGColorType& colorType)
     : CSSValue(classType)
     , m_colorType(colorType)
+    , m_valid(false)
 {
 }
 
@@ -45,13 +47,15 @@ PassRefPtr<RGBColor> SVGColor::rgbColor() const
     return RGBColor::create(m_color.rgb());
 }
 
-Color SVGColor::colorFromRGBColorString(const String& colorString)
+bool SVGColor::colorFromRGBColorString(const String& colorString, Color& color)
 {
     // FIXME: Rework css parser so it is more SVG aware.
-    RGBA32 color;
-    if (CSSParser::parseColor(color, colorString.stripWhiteSpace()))
-        return color;
-    return Color();
+    RGBA32 rgba;
+    if (CSSParser::parseColor(rgba, colorString.stripWhiteSpace())) {
+        color = rgba;
+        return true;
+    }
+    return false;
 }
 
 void SVGColor::setRGBColor(const String&, ExceptionCode& ec)
@@ -81,7 +85,7 @@ String SVGColor::customCssText() const
         // FIXME: No ICC color support.
         return m_color.serialized();
     case SVG_COLORTYPE_CURRENTCOLOR:
-        if (m_color.isValid())
+        if (m_valid)
             return m_color.serialized();
         return "currentColor";
     }