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diff --git a/Source/JavaScriptCore/runtime/TemplateRegistryKey.h b/Source/JavaScriptCore/runtime/TemplateRegistryKey.h
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+++ b/Source/JavaScriptCore/runtime/TemplateRegistryKey.h
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+/*
+ * Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.
+ *
+ * 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.
+ */
+
+#ifndef TemplateRegistryKey_h
+#define TemplateRegistryKey_h
+
+#include <limits>
+#include <wtf/Vector.h>
+#include <wtf/text/StringHash.h>
+#include <wtf/text/WTFString.h>
+
+namespace JSC {
+
+class TemplateRegistryKey {
+public:
+    typedef Vector<String, 4> StringVector;
+
+    TemplateRegistryKey(const StringVector& rawStrings, const StringVector& cookedStrings);
+    enum DeletedValueTag { DeletedValue };
+    TemplateRegistryKey(DeletedValueTag);
+    enum EmptyValueTag { EmptyValue };
+    TemplateRegistryKey(EmptyValueTag);
+
+    bool isDeletedValue() const { return m_rawStrings.isEmpty() && m_hash == std::numeric_limits<unsigned>::max(); }
+
+    bool isEmptyValue() const { return m_rawStrings.isEmpty() && !m_hash; }
+
+    unsigned hash() const { return m_hash; }
+
+    const StringVector& rawStrings() const { return m_rawStrings; }
+    const StringVector& cookedStrings() const { return m_cookedStrings; }
+
+    bool operator==(const TemplateRegistryKey& other) const { return m_hash == other.m_hash && m_rawStrings == other.m_rawStrings; }
+    bool operator!=(const TemplateRegistryKey& other) const { return m_hash != other.m_hash || m_rawStrings != other.m_rawStrings; }
+
+    struct Hasher {
+        static unsigned hash(const TemplateRegistryKey& key) { return key.hash(); }
+        static bool equal(const TemplateRegistryKey& a, const TemplateRegistryKey& b) { return a == b; }
+        static const bool safeToCompareToEmptyOrDeleted = false;
+    };
+
+private:
+    StringVector m_rawStrings;
+    StringVector m_cookedStrings;
+    unsigned m_hash { 0 };
+};
+
+inline TemplateRegistryKey::TemplateRegistryKey(const StringVector& rawStrings, const StringVector& cookedStrings)
+    : m_rawStrings(rawStrings)
+    , m_cookedStrings(cookedStrings)
+{
+    m_hash = 0;
+    for (const String& string : rawStrings)
+        m_hash += WTF::StringHash::hash(string);
+}
+
+inline TemplateRegistryKey::TemplateRegistryKey(DeletedValueTag)
+    : m_hash(std::numeric_limits<unsigned>::max())
+{
+}
+
+inline TemplateRegistryKey::TemplateRegistryKey(EmptyValueTag)
+    : m_hash(0)
+{
+}
+
+} // namespace JSC
+
+namespace WTF {
+template<typename T> struct DefaultHash;
+
+template<> struct DefaultHash<JSC::TemplateRegistryKey> {
+    typedef JSC::TemplateRegistryKey::Hasher Hash;
+};
+
+template<> struct HashTraits<JSC::TemplateRegistryKey> : CustomHashTraits<JSC::TemplateRegistryKey> {
+};
+
+} // namespace WTF
+
+#endif // TemplateRegistryKey_h