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

Source/core/page/FocusController.h

Index: Source/core/page/FocusController.h
diff --git a/Source/core/page/FocusController.h b/Source/core/page/FocusController.h
index 0983fcd5ce7589873dd3aef13ca5b4b72750fd37..8f5d08856eb5d80f69c0888990b416dd4befdc14 100644
--- a/Source/core/page/FocusController.h
+++ b/Source/core/page/FocusController.h
@@ -1,5 +1,6 @@
 /*
  * Copyright (C) 2006, 2007 Apple Inc. All rights reserved.
+ * Copyright (C) 2013 Opera Software ASA. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
@@ -74,6 +75,7 @@ public:
     bool advanceFocus(FocusType type) { return advanceFocus(type, false); }
 
     bool setFocusedElement(Element*, PassRefPtr<Frame>, FocusType = FocusTypeNone);
+    bool handleCSSFocusNavigation(FocusType);
 
     void setActive(bool);
     bool isActive() const { return m_isActive; }