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

Source/core/css/resolver/StyleBuilderConverter.cpp

Index: Source/core/css/resolver/StyleBuilderConverter.cpp
diff --git a/Source/core/css/resolver/StyleBuilderConverter.cpp b/Source/core/css/resolver/StyleBuilderConverter.cpp
index d022f6b373c163539de18ff7e55b53c13086e5e1..ca3a734b360466690c0574b2f2409b5fa773135f 100644
--- a/Source/core/css/resolver/StyleBuilderConverter.cpp
+++ b/Source/core/css/resolver/StyleBuilderConverter.cpp
@@ -166,4 +166,21 @@ PassRefPtr<SVGLength> StyleBuilderConverter::convertSVGLength(StyleResolverState
     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