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

Source/core/rendering/style/RenderStyle.h

Index: Source/core/rendering/style/RenderStyle.h
diff --git a/Source/core/rendering/style/RenderStyle.h b/Source/core/rendering/style/RenderStyle.h
index b4c6a66f91eeb74bd5b39731ceb5d4c8ee0c2ad8..28a897c0e09c662ef8b70118d4b8ffccaff9a8e3 100644
--- a/Source/core/rendering/style/RenderStyle.h
+++ b/Source/core/rendering/style/RenderStyle.h
@@ -833,6 +833,11 @@ public:
 
     unsigned tabSize() const { return rareInheritedData->m_tabSize; }
 
+    StyleNavigationValue navDown() const { return rareNonInheritedData->m_navigation.m_down; }
+    StyleNavigationValue navLeft() const { return rareNonInheritedData->m_navigation.m_left; }
+    StyleNavigationValue navRight() const { return rareNonInheritedData->m_navigation.m_right; }
+    StyleNavigationValue navUp() const { return rareNonInheritedData->m_navigation.m_up; }
+
     // End CSS3 Getters
 
     const AtomicString& flowThread() const { return rareNonInheritedData->m_flowThread; }
@@ -1257,6 +1262,11 @@ public:
 
     void setTabSize(unsigned size) { SET_VAR(rareInheritedData, m_tabSize, size); }
 
+    void setNavDown(StyleNavigationValue v) { SET_VAR(rareNonInheritedData, m_navigation.m_down, v); }
+    void setNavLeft(StyleNavigationValue v) { SET_VAR(rareNonInheritedData, m_navigation.m_left, v); }
+    void setNavRight(StyleNavigationValue v) { SET_VAR(rareNonInheritedData, m_navigation.m_right, v); }
+    void setNavUp(StyleNavigationValue v) { SET_VAR(rareNonInheritedData, m_navigation.m_up, v); }
+
     // End CSS3 Setters
 
     void setLineGrid(const AtomicString& lineGrid) { SET_VAR(rareInheritedData, m_lineGrid, lineGrid); }
@@ -1614,6 +1624,8 @@ public:
 
     static QuotesData* initialQuotes() { return 0; }
 
+    static StyleNavigationValue initialStyleNavigation() { DEFINE_STATIC_LOCAL(StyleNavigationValue, initial_navigation, ()); return initial_navigation; }
+
     // Keep these at the end.
     // FIXME: Why? Seems these should all be one big sorted list.
     static LineClampValue initialLineClamp() { return LineClampValue(); }