Implementation of CSS3 nav-up/down/left/right properties from CSS3 UI.

Source/core/css/resolver/StyleBuilderConverter.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
  * copyright notice, this list of conditions and the following disclaimer
  * in the documentation and/or other materials provided with the
  * distribution.
  *     * Neither the name of Google Inc. nor the names of its
@@ skipping 148 matching lines @@
     if (state.useSVGZoomRules())
         return primitiveValue->computeLength<float>(state.cssToLengthConversionData().copyWithAdjustedZoom(1));
     return primitiveValue->computeLength<float>(state.cssToLengthConversionData());
 }
 
 PassRefPtr<SVGLength> StyleBuilderConverter::convertSVGLength(StyleResolverState&, CSSValue* value)
 {
     return SVGLength::fromCSSPrimitiveValue(toCSSPrimitiveValue(value));
 }
 
+StyleNavigationValue StyleBuilderConverter::convertStyleNavigationValue(StyleResolverState&, CSSValue* value)
+{
+    CSSValueListIterator iterator = value;
+    if (!iterator.hasMore()) {
+        // auto value.
+        return StyleNavigationValue();
+    }
+
+    String id = toCSSPrimitiveValue(iterator.value())->getStringValue();
+    iterator.advance();
+    String target = "current";
+    if (iterator.hasMore())
+        target = toCSSPrimitiveValue(iterator.value())->getStringValue();
+
+    return StyleNavigationValue(id, target);
+}
+
 } // namespace WebCore