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diff --git a/Source/WebCore/page/SessionID.h b/Source/WebCore/page/SessionID.h
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+/*
+ * Copyright (C) 2014 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
+
+#include <wtf/HashFunctions.h>
+#include <wtf/HashTraits.h>
+
+namespace WebCore {
+
+class SessionID {
+public:
+    SessionID()
+        : SessionID(emptySessionID()) { }
+    explicit SessionID(uint64_t sessionID)
+        : m_sessionID(sessionID) { }
+    bool isValid() const { return *this != emptySessionID(); }
+    bool isEphemeral() const { return *this != defaultSessionID(); }
+    uint64_t sessionID() const { return m_sessionID; }
+    bool operator==(SessionID sessionID) const { return m_sessionID == sessionID.m_sessionID; }
+    bool operator!=(SessionID sessionID) const { return m_sessionID != sessionID.m_sessionID; }
+    bool isAlwaysOnLoggingAllowed() const { return !isEphemeral(); }
+
+    static SessionID emptySessionID() { return SessionID(0); }
+    static SessionID defaultSessionID() { return SessionID(1); }
+    static SessionID legacyPrivateSessionID() { return SessionID(2); }
+private:
+    uint64_t m_sessionID;
+};
+
+} // namespace WebCore
+
+namespace WTF {
+
+// The empty value is emptySessionID(), the deleted value is (-1)
+struct SessionIDHash {
+    static unsigned hash(const WebCore::SessionID& p) { return intHash(p.sessionID()); }
+    static bool equal(const WebCore::SessionID& a, const WebCore::SessionID& b) { return a == b; }
+    static const bool safeToCompareToEmptyOrDeleted = true;
+};
+template<> struct HashTraits<WebCore::SessionID> : GenericHashTraits<WebCore::SessionID> {
+    static const uint64_t deletedValueIdentifier = std::numeric_limits<uint64_t>::max();
+    static WebCore::SessionID emptyValue() { return WebCore::SessionID::emptySessionID(); }
+
+    static void constructDeletedValue(WebCore::SessionID& slot) { slot = WebCore::SessionID(deletedValueIdentifier); }
+    static bool isDeletedValue(const WebCore::SessionID& slot) { return slot == WebCore::SessionID(deletedValueIdentifier); }
+};
+template<> struct DefaultHash<WebCore::SessionID> {
+    typedef SessionIDHash Hash;
+};
+
+} // namespace WTF