diff -r 000000000000 -r 4f2f89ce4247 WebKit/chromium/src/BackForwardListClientImpl.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/WebKit/chromium/src/BackForwardListClientImpl.cpp	Fri Sep 17 09:02:29 2010 +0300
@@ -0,0 +1,136 @@
+/*
+ * Copyright (C) 2009 Google 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:
+ *
+ *     * 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.
+ */
+
+#include "config.h"
+#include "BackForwardListClientImpl.h"
+
+#include "HistoryItem.h"
+#include "WebViewClient.h"
+#include "WebViewImpl.h"
+
+using namespace WebCore;
+
+namespace WebKit {
+
+const char backForwardNavigationScheme[] = "chrome-back-forward";
+
+BackForwardListClientImpl::BackForwardListClientImpl(WebViewImpl* webView)
+    : m_webView(webView)
+{
+}
+
+BackForwardListClientImpl::~BackForwardListClientImpl()
+{
+}
+
+void BackForwardListClientImpl::setCurrentHistoryItem(HistoryItem* item)
+{
+    m_previousItem = m_currentItem;
+    m_currentItem = item;
+}
+
+HistoryItem* BackForwardListClientImpl::previousHistoryItem() const
+{
+    return m_previousItem.get();
+}
+
+void BackForwardListClientImpl::addItem(PassRefPtr<HistoryItem> item)
+{
+    m_previousItem = m_currentItem;
+    m_currentItem = item;
+
+    // If WebCore adds a new HistoryItem, it means this is a new navigation (ie,
+    // not a reload or back/forward).
+    m_webView->observeNewNavigation();
+
+    if (m_webView->client())
+        m_webView->client()->didAddHistoryItem();
+}
+
+void BackForwardListClientImpl::goToItem(HistoryItem* item)
+{
+    m_previousItem = m_currentItem;
+    m_currentItem = item;
+
+    if (m_pendingHistoryItem == item)
+        m_pendingHistoryItem = 0;
+}
+
+HistoryItem* BackForwardListClientImpl::currentItem()
+{
+    return m_currentItem.get();
+}
+
+HistoryItem* BackForwardListClientImpl::itemAtIndex(int index)
+{
+    if (!m_webView->client() || index > forwardListCount() || -index > backListCount())
+        return 0;
+
+    // Since we don't keep the entire back/forward list, we have no way to
+    // properly implement this method.  We return a dummy entry instead that we
+    // intercept in our FrameLoaderClient implementation in case WebCore asks
+    // to navigate to this HistoryItem.
+
+    // FIXME: We should change WebCore to handle history.{back,forward,go}
+    // differently.  It should perhaps just ask the FrameLoaderClient to
+    // perform those navigations.
+
+    String url_string = String::format(
+        "%s://go/%d", backForwardNavigationScheme, index);
+
+    m_pendingHistoryItem =
+        HistoryItem::create(url_string, String(), 0.0);
+    return m_pendingHistoryItem.get();
+}
+
+int BackForwardListClientImpl::backListCount()
+{
+    if (!m_webView->client())
+        return 0;
+
+    return m_webView->client()->historyBackListCount();
+}
+
+int BackForwardListClientImpl::forwardListCount()
+{
+    if (!m_webView->client())
+        return 0;
+
+    return m_webView->client()->historyForwardListCount();
+}
+
+void BackForwardListClientImpl::close()
+{
+    m_currentItem = 0;
+    m_previousItem = 0;
+    m_pendingHistoryItem = 0;
+}
+
+} // namespace WebKit