[Alignment] Single class for holding the alignment data.

Source/core/style/StyleContentAlignmentData.h

+// Copyright (c) 2015 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 StyleContentAlignmentData_h
+#define StyleContentAlignmentData_h
+
+#include "core/style/ComputedStyleConstants.h"
+
+namespace blink {
+
+class StyleContentAlignmentData {
+public:
+    // Style data for Content-Distribution properties: align-content, justify-content.
+    // <content-distribution> || [ <overflow-position>? && <content-position> ]
+    StyleContentAlignmentData(ContentPosition position, ContentDistributionType distribution, OverflowAlignment overflow = OverflowAlignmentDefault)
+        : m_position(position)
+        , m_distribution(distribution)
+        , m_overflow(overflow)
+    {
+    }
+
+    void setPosition(ContentPosition position) { m_position = position; }
+    void setDistribution(ContentDistributionType distribution) { m_distribution = distribution; }
+    void setOverflow(OverflowAlignment overflow) { m_overflow = overflow; }
+
+    ContentPosition position() const { return static_cast<ContentPosition>(m_position); }
+    ContentDistributionType distribution() const { return static_cast<ContentDistributionType>(m_distribution); }
+    OverflowAlignment overflow() const { return static_cast<OverflowAlignment>(m_overflow); }
+
+    bool operator==(const StyleContentAlignmentData& o) const
+    {
+        return m_position == o.m_position && m_distribution == o.m_distribution && m_overflow == o.m_overflow;
+    }
+
+    bool operator!=(const StyleContentAlignmentData& o) const
+    {
+        return !(*this == o);
+    }
+
+private:
+    unsigned m_position : 4; // ContentPosition
+    unsigned m_distribution : 3; // ContentDistributionType
+    unsigned m_overflow : 2; // OverflowAlignment
+};
+
+} // namespace blink
+
+#endif // StyleContentAlignmentData_h