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diff --git a/Source/WebCore/css/CSSGridAutoRepeatValue.h b/Source/WebCore/css/CSSGridAutoRepeatValue.h
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+/*
+ * Copyright (C) 2016 Igalia S.L.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * 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.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * OWNER OR 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.
+ */
+
+#pragma once
+
+#include "CSSValueKeywords.h"
+#include "CSSValueList.h"
+
+namespace WebCore {
+
+// CSSGridAutoRepeatValue stores the track sizes and line numbers when the auto-repeat
+// syntax is used
+//
+// Right now the auto-repeat syntax is as follows:
+// <auto-repeat>  = repeat( [ auto-fill | auto-fit ], <line-names>? <fixed-size> <line-names>? )
+//
+// meaning that only one fixed size track is allowed. It could be argued that a different
+// class storing two CSSGridLineNamesValue and one CSSValue (for the track size) fits
+// better but the CSSWG has left the door open to allow more than one track in the
+// future. That's why we're using a list, it's prepared for future changes and it also
+// allows us to keep the parsing algorithm almost intact.
+class CSSGridAutoRepeatValue final : public CSSValueList {
+public:
+    static Ref<CSSGridAutoRepeatValue> create(CSSValueID id)
+    {
+        return adoptRef(*new CSSGridAutoRepeatValue(id));
+    }
+
+    String customCSSText() const;
+    CSSValueID autoRepeatID() const { return m_autoRepeatID; }
+
+private:
+    CSSGridAutoRepeatValue(CSSValueID id)
+        : CSSValueList(GridAutoRepeatClass, SpaceSeparator)
+        , m_autoRepeatID(id)
+    {
+        ASSERT(id == CSSValueAutoFill || id == CSSValueAutoFit);
+    }
+
+    const CSSValueID m_autoRepeatID;
+};
+
+} // namespace WebCore
+
+SPECIALIZE_TYPE_TRAITS_CSS_VALUE(CSSGridAutoRepeatValue, isGridAutoRepeatValue());