[Alignment] Single class for holding the alignment data.

Source/core/style/StyleAlignmentData.h

+// Copyright (c) 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef StyleAlignmentData_h
+#define StyleAlignmentData_h
+
+#include "core/style/ComputedStyleConstants.h"
+
+namespace blink {
+
+class StyleAlignmentData {
+public:
+    StyleAlignmentData(ItemPosition, OverflowAlignment, ItemPositionType = NonLegacyPosition);
+    StyleAlignmentData(ContentPosition, ContentDistributionType, OverflowAlignment);

[Julien - ping for review, 2015/04/09 15:23:20]

I would love a class comment to explain these constructors.

[jfernandez, 2015/04/09 15:55:55]

Done.

+    StyleAlignmentData(const StyleAlignmentData&);
+
+    bool operator==(const StyleAlignmentData& o) const
+    {
+        return m_itemPosition == o.m_itemPosition && m_contentPosition == o.m_contentPosition && m_distribution == o.m_distribution && m_positionType == o.m_positionType && m_overflow == o.m_overflow && m_positionType == o.m_positionType;

[Julien - ping for review, 2015/04/09 15:23:20]

Nit: This doesn't follow the order below (m_positionType and m_overflow are
swapped).

[jfernandez, 2015/04/09 15:55:55]

Done.

+    }
+
+    bool operator!=(const StyleAlignmentData& o) const
+    {
+        return !(*this == o);
+    }
+
+    ItemPosition m_itemPosition;
+    ContentPosition m_contentPosition;
+    ContentDistributionType m_distribution;
+    ItemPositionType m_positionType;
+    OverflowAlignment m_overflow;
+};
+
+} // namespace blink
+
+#endif // StyleAlignmentData_h