Move isValid/isCurrentColor from Color to StyleColor

Source/core/rendering/svg/SVGRenderingContext.cpp

 /*
  * Copyright (C) 2007, 2008 Rob Buis <buis@kde.org>
  * Copyright (C) 2007 Nikolas Zimmermann <zimmermann@kde.org>
  * Copyright (C) 2007 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Google, Inc.  All rights reserved.
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) Research In Motion Limited 2009-2010. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
@@ skipping 104 matching lines @@
                     m_renderingFlags |= RestoreGraphicsContext;
                 }
                 m_paintInfo->context->setCompositeOperation(CompositeSourceOver, blendMode);
             }
             m_paintInfo->context->beginTransparencyLayer(opacity);
             m_renderingFlags |= EndOpacityLayer;
         }
 
         if (shadow) {
             m_paintInfo->context->clip(repaintRect);
-            m_paintInfo->context->setShadow(IntSize(roundToInt(shadow->x()), roundToInt(shadow->y())), shadow->blur(), shadow->color());
+            m_paintInfo->context->setShadow(IntSize(roundToInt(shadow->x()),
+                roundToInt(shadow->y())), shadow->blur(),
+                m_object->resolveColor(shadow->color(), Color::stdShadowColor));
             m_paintInfo->context->beginTransparencyLayer(1);
             m_renderingFlags |= EndShadowLayer;
         }
     }
 
     ClipPathOperation* clipPathOperation = style->clipPath();
     if (clipPathOperation && clipPathOperation->getOperationType() == ClipPathOperation::SHAPE) {
         ShapeClipPathOperation* clipPath = static_cast<ShapeClipPathOperation*>(clipPathOperation);
         m_paintInfo->context->clipPath(clipPath->path(object->objectBoundingBox()), clipPath->windRule());
     }
@@ skipping 213 matching lines @@
             toRenderSVGImage(m_object)->paintForeground(bufferedInfo);
         } else
             return false;
     }
 
     m_paintInfo->context->drawImageBuffer(imageBuffer.get(), boundingBox);
     return true;
 }
 
 }