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diff --git a/Source/WebCore/rendering/style/GridArea.h b/Source/WebCore/rendering/style/GridArea.h
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+++ b/Source/WebCore/rendering/style/GridArea.h
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+/*
+ * Copyright (C) 2013 Google Inc. All rights reserved.
+ * Copyright (C) 2013, 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 "GridPositionsResolver.h"
+#include <wtf/HashMap.h>
+#include <wtf/text/WTFString.h>
+
+namespace WebCore {
+
+// A span in a single direction (either rows or columns). Note that |startLine|
+// and |endLine| are grid lines' indexes.
+// Despite line numbers in the spec start in "1", the indexes here start in "0".
+class GridSpan {
+public:
+
+    static GridSpan untranslatedDefiniteGridSpan(int startLine, int endLine)
+    {
+        return GridSpan(startLine, endLine, UntranslatedDefinite);
+    }
+
+    static GridSpan translatedDefiniteGridSpan(unsigned startLine, unsigned endLine)
+    {
+        return GridSpan(startLine, endLine, TranslatedDefinite);
+    }
+
+    static GridSpan indefiniteGridSpan()
+    {
+        return GridSpan(0, 1, Indefinite);
+    }
+
+    bool operator==(const GridSpan& o) const
+    {
+        return m_type == o.m_type && m_startLine == o.m_startLine && m_endLine == o.m_endLine;
+    }
+
+    unsigned integerSpan() const
+    {
+        ASSERT(isTranslatedDefinite());
+        return m_endLine - m_startLine;
+    }
+
+    int untranslatedStartLine() const
+    {
+        ASSERT(m_type == UntranslatedDefinite);
+        return m_startLine;
+    }
+
+    int untranslatedEndLine() const
+    {
+        ASSERT(m_type == UntranslatedDefinite);
+        return m_endLine;
+    }
+
+    unsigned startLine() const
+    {
+        ASSERT(isTranslatedDefinite());
+        ASSERT(m_endLine >= 0);
+        return m_startLine;
+    }
+
+    unsigned endLine() const
+    {
+        ASSERT(isTranslatedDefinite());
+        ASSERT(m_endLine > 0);
+        return m_endLine;
+    }
+
+    struct GridSpanIterator {
+        GridSpanIterator(unsigned value)
+            : value(value)
+        {
+        }
+
+        operator unsigned&() { return value; }
+        unsigned operator*() const { return value; }
+
+        unsigned value;
+    };
+
+    GridSpanIterator begin() const
+    {
+        ASSERT(isTranslatedDefinite());
+        return m_startLine;
+    }
+
+    GridSpanIterator end() const
+    {
+        ASSERT(isTranslatedDefinite());
+        return m_endLine;
+    }
+
+    bool isTranslatedDefinite() const
+    {
+        return m_type == TranslatedDefinite;
+    }
+
+    bool isIndefinite() const
+    {
+        return m_type == Indefinite;
+    }
+
+    void translate(unsigned offset)
+    {
+        ASSERT(m_type == UntranslatedDefinite);
+
+        m_type = TranslatedDefinite;
+        m_startLine += offset;
+        m_endLine += offset;
+
+        ASSERT(m_startLine >= 0);
+        ASSERT(m_endLine > 0);
+    }
+
+private:
+
+    enum GridSpanType {UntranslatedDefinite, TranslatedDefinite, Indefinite};
+
+    GridSpan(int startLine, int endLine, GridSpanType type)
+        : m_type(type)
+    {
+#if ENABLE(ASSERT)
+        ASSERT(startLine < endLine);
+        if (type == TranslatedDefinite) {
+            ASSERT(startLine >= 0);
+            ASSERT(endLine > 0);
+        }
+#endif
+
+        m_startLine = std::max(-kGridMaxTracks, std::min(startLine, kGridMaxTracks - 1));
+        m_endLine = std::max(-kGridMaxTracks + 1, std::min(endLine, kGridMaxTracks));
+    }
+
+    int m_startLine;
+    int m_endLine;
+    GridSpanType m_type;
+
+
+};
+
+// This represents a grid area that spans in both rows' and columns' direction.
+class GridArea {
+public:
+    // HashMap requires a default constuctor.
+    GridArea()
+        : columns(GridSpan::indefiniteGridSpan())
+        , rows(GridSpan::indefiniteGridSpan())
+    {
+    }
+
+    GridArea(const GridSpan& r, const GridSpan& c)
+        : columns(c)
+        , rows(r)
+    {
+    }
+
+    bool operator==(const GridArea& o) const
+    {
+        return columns == o.columns && rows == o.rows;
+    }
+
+    bool operator!=(const GridArea& o) const
+    {
+        return !(*this == o);
+    }
+
+    GridSpan columns;
+    GridSpan rows;
+};
+
+typedef HashMap<String, GridArea> NamedGridAreaMap;
+
+} // namespace WebCore