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

Source/core/rendering/style/RenderStyle.cpp

Index: Source/core/rendering/style/RenderStyle.cpp
diff --git a/Source/core/rendering/style/RenderStyle.cpp b/Source/core/rendering/style/RenderStyle.cpp
index 31a85c2cf2e1c86b8ef515f2d1cd965dff0a254e..82ead2690918cbe5b4f37cc3c4bb8648fcdd071c 100644
--- a/Source/core/rendering/style/RenderStyle.cpp
+++ b/Source/core/rendering/style/RenderStyle.cpp
@@ -2,6 +2,7 @@
  * Copyright (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Adobe Systems Incorporated. All rights reserved.
+ * Copyright (C) 2013 Opera Software ASA. 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
@@ -792,6 +793,22 @@ void RenderStyle::setContent(QuoteType quote, bool add)
     rareNonInheritedData.access()->m_content = ContentData::create(quote);
 }
 
+void RenderStyle::setNavigation(const StyleNavigationData& data)
+{
+    rareNonInheritedData.access()->m_navigation = adoptPtr(new StyleNavigationData(data));
+}
+
+void RenderStyle::setNavigation(StyleNavigationData::NavigationDirection direction, const StyleNavigationValue& value, bool add)
+{
+    if (add && rareNonInheritedData->m_navigation) {
+        rareNonInheritedData.access()->m_navigation->SetProperty(direction, value);
+        return;
+    }
+
+    StyleNavigationData data(direction, value);
+    setNavigation(data);
+}
+
 blink::WebBlendMode RenderStyle::blendMode() const
 {
     if (RuntimeEnabledFeatures::cssCompositingEnabled())