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diff --git a/Source/WebCore/contentextensions/MutableRange.h b/Source/WebCore/contentextensions/MutableRange.h
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+/*
+ * Copyright (C) 2015 Apple Inc. 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.
+ */
+
+#pragma once
+
+#if ENABLE(CONTENT_EXTENSIONS)
+
+namespace WebCore {
+
+namespace ContentExtensions {
+
+template <typename CharacterType, typename DataType>
+class MutableRange {
+    typedef MutableRange<CharacterType, DataType> TypedMutableRange;
+public:
+    MutableRange(uint32_t nextRangeIndex, CharacterType first, CharacterType last)
+        : nextRangeIndex(nextRangeIndex)
+        , first(first)
+        , last(last)
+    {
+        ASSERT(first <= last);
+    }
+
+    MutableRange(const DataType& data, uint32_t nextRangeIndex, CharacterType first, CharacterType last)
+        : data(data)
+        , nextRangeIndex(nextRangeIndex)
+        , first(first)
+        , last(last)
+    {
+        ASSERT(first <= last);
+    }
+
+    MutableRange(DataType&& data, uint32_t nextRangeIndex, CharacterType first, CharacterType last)
+        : data(WTFMove(data))
+        , nextRangeIndex(nextRangeIndex)
+        , first(first)
+        , last(last)
+    {
+        ASSERT(first <= last);
+    }
+
+    MutableRange(MutableRange&& other)
+        : data(WTFMove(other.data))
+        , nextRangeIndex(other.nextRangeIndex)
+        , first(other.first)
+        , last(other.last)
+    {
+        ASSERT(first <= last);
+    }
+
+    TypedMutableRange& operator=(TypedMutableRange&& other)
+    {
+        data = WTFMove(other.data);
+        nextRangeIndex = WTFMove(other.nextRangeIndex);
+        first = WTFMove(other.first);
+        last = WTFMove(other.last);
+        return *this;
+    }
+
+    DataType data;
+
+    // We use a funny convention: if there are no nextRange, the nextRangeIndex is zero.
+    // This is faster to check than a special value in many cases.
+    // We can use zero because ranges can only form a chain, and the first range is always zero by convention.
+    // When we insert something in from of the first range, we swap the values.
+    uint32_t nextRangeIndex;
+    CharacterType first;
+    CharacterType last;
+};
+
+} // namespace ContentExtensions
+} // namespace WebCore
+
+#endif // ENABLE(CONTENT_EXTENSIONS)