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diff --git a/Source/WebKit2/UIProcess/WebPageGroup.h b/Source/WebKit2/UIProcess/WebPageGroup.h
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+++ b/Source/WebKit2/UIProcess/WebPageGroup.h
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+/*
+ * Copyright (C) 2010 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.
+ */
+
+#ifndef WebPageGroup_h
+#define WebPageGroup_h
+
+#include "APIObject.h"
+#include "WebPageGroupData.h"
+#include <wtf/Forward.h>
+#include <wtf/HashSet.h>
+
+namespace WebKit {
+
+class WebPreferences;
+class WebPageProxy;
+
+class WebPageGroup : public APIObject {
+public:
+    static const Type APIType = TypePageGroup;
+
+    static PassRefPtr<WebPageGroup> create(const String& identifier = String(), bool visibleToInjectedBundle = true);
+    static WebPageGroup* get(uint64_t pageGroupID);
+
+    virtual ~WebPageGroup();
+
+    void addPage(WebPageProxy*);
+    void removePage(WebPageProxy*);
+
+    const String& identifier() const { return m_data.identifer; }
+    uint64_t pageGroupID() const { return m_data.pageGroupID; }
+
+    const WebPageGroupData& data() { return m_data; }
+
+    void setPreferences(WebPreferences*);
+    WebPreferences* preferences() const;
+    void preferencesDidChange();
+
+private:
+    WebPageGroup(const String& identifier, bool visibleToInjectedBundle);
+
+    virtual Type type() const { return APIType; }
+
+    WebPageGroupData m_data;
+    RefPtr<WebPreferences> m_preferences;
+    HashSet<WebPageProxy*> m_pages;
+};
+
+} // namespace WebKit
+
+#endif // WebPageGroup_h