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diff --git a/Source/WebKit2/Shared/WebBackForwardListItem.cpp b/Source/WebKit2/Shared/WebBackForwardListItem.cpp
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+++ b/Source/WebKit2/Shared/WebBackForwardListItem.cpp
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+/*
+ * Copyright (C) 2010, 2011 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.
+ */
+
+#include "WebBackForwardListItem.h"
+
+#include "DataReference.h"
+#include "WebCoreArgumentCoders.h"
+
+namespace WebKit {
+
+static uint64_t highestUsedItemID = 0;
+
+WebBackForwardListItem::WebBackForwardListItem(const String& originalURL, const String& url, const String& title, const uint8_t* backForwardData, size_t backForwardDataSize, uint64_t itemID)
+    : m_originalURL(originalURL)
+    , m_url(url)
+    , m_title(title)
+    , m_itemID(itemID)
+{
+    if (m_itemID > highestUsedItemID)
+        highestUsedItemID = m_itemID;
+
+    setBackForwardData(backForwardData, backForwardDataSize);
+}
+
+WebBackForwardListItem::~WebBackForwardListItem()
+{
+}
+
+uint64_t WebBackForwardListItem::highedUsedItemID()
+{
+    return highestUsedItemID;
+}
+
+void WebBackForwardListItem::setBackForwardData(const uint8_t* data, size_t size)
+{
+    m_backForwardData.reserveCapacity(size);
+    m_backForwardData.append(data, size);
+}
+
+void WebBackForwardListItem::encode(CoreIPC::ArgumentEncoder& encoder) const
+{
+    encoder.encode(m_originalURL);
+    encoder.encode(m_url);
+    encoder.encode(m_title);
+    encoder.encode(m_itemID);
+    encoder.encode(CoreIPC::DataReference(m_backForwardData.data(), m_backForwardData.size()));
+}
+
+PassRefPtr<WebBackForwardListItem> WebBackForwardListItem::decode(CoreIPC::ArgumentDecoder& decoder)
+{
+    String originalURL;
+    if (!decoder.decode(originalURL))
+        return 0;
+
+    String url;
+    if (!decoder.decode(url))
+        return 0;
+
+    String title;
+    if (!decoder.decode(title))
+        return 0;
+
+    uint64_t itemID;
+    if (!decoder.decode(itemID))
+        return 0;
+    
+    CoreIPC::DataReference data;
+    if (!decoder.decode(data))
+        return 0;
+
+    return create(originalURL, url, title, data.data(), data.size(), itemID);
+}
+
+} // namespace WebKit