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

Source/core/rendering/style/StyleRareNonInheritedData.cpp

Index: Source/core/rendering/style/StyleRareNonInheritedData.cpp
diff --git a/Source/core/rendering/style/StyleRareNonInheritedData.cpp b/Source/core/rendering/style/StyleRareNonInheritedData.cpp
index f5a16f9a6dc449566e36ee044dee2096947038fe..76c152d4bf7df6c02236ac25bdcd4bbcf79154ee 100644
--- a/Source/core/rendering/style/StyleRareNonInheritedData.cpp
+++ b/Source/core/rendering/style/StyleRareNonInheritedData.cpp
@@ -44,6 +44,7 @@ StyleRareNonInheritedData::StyleRareNonInheritedData()
     , lineClamp(RenderStyle::initialLineClamp())
     , m_draggableRegionMode(DraggableRegionNone)
     , m_mask(FillLayer(MaskFillLayer))
+    , m_nav()
     , m_pageSize()
     , m_shapeInside(RenderStyle::initialShapeInside())
     , m_shapeOutside(RenderStyle::initialShapeOutside())
@@ -109,6 +110,7 @@ StyleRareNonInheritedData::StyleRareNonInheritedData(const StyleRareNonInherited
     , m_transitions(o.m_transitions ? adoptPtr(new CSSAnimationDataList(*o.m_transitions)) : nullptr)
     , m_mask(o.m_mask)
     , m_maskBoxImage(o.m_maskBoxImage)
+    , m_nav(o.m_nav)
     , m_pageSize(o.m_pageSize)
     , m_shapeInside(o.m_shapeInside)
     , m_shapeOutside(o.m_shapeOutside)
@@ -184,6 +186,7 @@ bool StyleRareNonInheritedData::operator==(const StyleRareNonInheritedData& o) c
         && transitionDataEquivalent(o)
         && m_mask == o.m_mask
         && m_maskBoxImage == o.m_maskBoxImage
+        && m_nav == o.m_nav
         && m_pageSize == o.m_pageSize
         && m_shapeInside == o.m_shapeInside
         && m_shapeOutside == o.m_shapeOutside