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diff --git a/Source/WebCore/rendering/style/GridPositionsResolver.h b/Source/WebCore/rendering/style/GridPositionsResolver.h
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+++ b/Source/WebCore/rendering/style/GridPositionsResolver.h
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+/*
+ * Copyright (C) 2014-2016 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 "GridPosition.h"
+
+namespace WebCore {
+
+class GridSpan;
+class RenderBox;
+class RenderStyle;
+
+enum GridTrackSizingDirection {
+    ForColumns,
+    ForRows
+};
+
+class NamedLineCollection {
+    WTF_MAKE_NONCOPYABLE(NamedLineCollection);
+public:
+    NamedLineCollection(const RenderStyle&, const String& namedLine, GridTrackSizingDirection, unsigned lastLine, unsigned autoRepeatTracksCount);
+
+    static bool isValidNamedLineOrArea(const String& namedLine, const RenderStyle&, GridPositionSide);
+
+    bool hasNamedLines() const;
+    unsigned firstPosition() const;
+
+    bool contains(unsigned line) const;
+
+private:
+    size_t find(unsigned line) const;
+
+    const Vector<unsigned>* m_namedLinesIndexes { nullptr };
+    const Vector<unsigned>* m_autoRepeatNamedLinesIndexes { nullptr };
+
+    unsigned m_insertionPoint;
+    unsigned m_lastLine;
+    unsigned m_autoRepeatTotalTracks;
+    unsigned m_autoRepeatTrackListLength;
+};
+
+// Class with all the code related to grid items positions resolution.
+class GridPositionsResolver {
+public:
+    static unsigned spanSizeForAutoPlacedItem(const RenderStyle&, const RenderBox&, GridTrackSizingDirection);
+    static GridSpan resolveGridPositionsFromStyle(const RenderStyle&, const RenderBox&, GridTrackSizingDirection, unsigned autoRepeatTracksCount);
+    static unsigned explicitGridColumnCount(const RenderStyle&, unsigned autoRepeatColumnsCount);
+    static unsigned explicitGridRowCount(const RenderStyle&, unsigned autoRepeatRowsCount);
+};
+
+} // namespace WebCore