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

Source/core/rendering/style/StyleNavigationData.h

Index: Source/core/rendering/style/StyleNavigationData.h
diff --git a/Source/core/rendering/style/StyleNavigationData.h b/Source/core/rendering/style/StyleNavigationData.h
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+/*
+ * Copyright (C) 2011 Kyounga Ra (kyounga.ra@gmail.com)
+ * Copyright (C) 2014 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
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public License
+ * along with this library; see the file COPYING.LIB.  If not, write to
+ * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
+ * Boston, MA 02110-1301, USA.
+ *
+ */
+
+#ifndef StyleNavigationData_h
+#define StyleNavigationData_h
+
+#include "core/rendering/style/StyleNavigationValue.h"
+#include "wtf/PassRefPtr.h"
+#include "wtf/RefCounted.h"
+
+namespace blink {
+
+class StyleNavigationData : public RefCounted<StyleNavigationData> {
+public:
+    static PassRefPtr<StyleNavigationData> create() { return adoptRef(new StyleNavigationData()); }
+    PassRefPtr<StyleNavigationData> copy() const { return adoptRef(new StyleNavigationData(*this)); }
+
+    bool operator==(const StyleNavigationData& o) const
+    {
+        return m_up == o.m_up && m_down == o.m_down && m_left == o.m_left && m_right == o.m_right;
+    }
+
+    bool operator!=(const StyleNavigationData& o) const
+    {
+        return !(*this == o);
+    }
+
+    const StyleNavigationValue& up() const { return m_up; }
+    const StyleNavigationValue& down() const { return m_down; }
+    const StyleNavigationValue& left() const { return m_left; }
+    const StyleNavigationValue& right() const { return m_right; }
+
+    void setUp(const StyleNavigationValue& value) { m_up = value; }
+    void setDown(const StyleNavigationValue& value) { m_down = value; }
+    void setLeft(const StyleNavigationValue& value) { m_left = value; }
+    void setRight(const StyleNavigationValue& value) { m_right = value; }
+
+private:
+    StyleNavigationData();
+    StyleNavigationData(const StyleNavigationData&);
+
+    StyleNavigationValue m_up;
+    StyleNavigationValue m_down;
+    StyleNavigationValue m_left;
+    StyleNavigationValue m_right;
+};
+
+} // namespace blink
+
+#endif // StyleNavigationData_h