Move isValid/isCurrentColor from Color to StyleColor

Source/web/LinkHighlight.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
@@ skipping 224 matching lines @@
 }
 
 void LinkHighlight::paintContents(WebCanvas* canvas, const WebRect& webClipRect, bool, WebFloatRect&)
 {
     if (!m_node || !m_node->renderer())
         return;
 
     GraphicsContext gc(canvas);
     IntRect clipRect(IntPoint(webClipRect.x, webClipRect.y), IntSize(webClipRect.width, webClipRect.height));
     gc.clip(clipRect);
-    gc.setFillColor(m_node->renderer()->style()->tapHighlightColor());
+    gc.setFillColor(m_node->renderer()->resolveColor(CSSPropertyWebkitTapHighlightColor));
     gc.fillPath(m_path);
 }
 
 void LinkHighlight::startHighlightAnimationIfNeeded()
 {
     if (m_isAnimating)
         return;
 
     m_isAnimating = true;
     const float startOpacity = 1;
@@ skipping 78 matching lines @@
     // Make sure we update geometry on the next callback from WebViewImpl::layout().
     m_geometryNeedsUpdate = true;
 }
 
 WebLayer* LinkHighlight::layer()
 {
     return clipLayer();
 }
 
 } // namespace WeKit