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diff --git a/Source/WebCore/css/CSSContentDistributionValue.cpp b/Source/WebCore/css/CSSContentDistributionValue.cpp
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+++ b/Source/WebCore/css/CSSContentDistributionValue.cpp
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+/*
+ * Copyright (C) 2015 Igalia S.L. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "CSSContentDistributionValue.h"
+
+#include "CSSValueList.h"
+#include <wtf/text/StringBuilder.h>
+
+namespace WebCore {
+
+CSSContentDistributionValue::CSSContentDistributionValue(CSSValueID distribution, CSSValueID position, CSSValueID overflow)
+    : CSSValue(CSSContentDistributionClass)
+    , m_distribution(distribution)
+    , m_position(position)
+    , m_overflow(overflow)
+{
+}
+
+CSSContentDistributionValue::~CSSContentDistributionValue()
+{
+}
+
+String CSSContentDistributionValue::customCSSText() const
+{
+    auto list = CSSValueList::createSpaceSeparated();
+    if (m_distribution != CSSValueInvalid)
+        list->append(distribution());
+    if (m_position != CSSValueInvalid)
+        list->append(position());
+    if (m_overflow != CSSValueInvalid)
+        list->append(overflow());
+    return list->customCSSText();
+}
+
+bool CSSContentDistributionValue::equals(const CSSContentDistributionValue& other) const
+{
+    return m_distribution == other.m_distribution && m_position == other.m_position && m_overflow == other.m_overflow;
+}
+
+}