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diff --git a/Source/WebKit2/UIProcess/WebProcessLifetimeObserver.h b/Source/WebKit2/UIProcess/WebProcessLifetimeObserver.h
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+++ b/Source/WebKit2/UIProcess/WebProcessLifetimeObserver.h
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+/*
+ * Copyright (C) 2015 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 WebProcessLifetimeObserver_h
+#define WebProcessLifetimeObserver_h
+
+#include <wtf/HashCountedSet.h>
+#include <wtf/IteratorRange.h>
+
+namespace IPC {
+class Connection;
+}
+
+namespace WebKit {
+
+class WebPageProxy;
+class WebProcessProxy;
+
+class WebProcessLifetimeObserver {
+public:
+    WebProcessLifetimeObserver();
+    virtual ~WebProcessLifetimeObserver();
+
+    void addWebPage(WebPageProxy&);
+    void removeWebPage(WebPageProxy&);
+
+    WTF::IteratorRange<HashCountedSet<WebProcessProxy*>::const_iterator::Keys> processes() const;
+
+private:
+    friend class WebProcessLifetimeTracker;
+
+    virtual void webPageWasAdded(WebPageProxy&) { }
+    virtual void webProcessWillOpenConnection(WebProcessProxy&, IPC::Connection&) { }
+    virtual void webPageWillOpenConnection(WebPageProxy&, IPC::Connection&) { }
+    virtual void webPageDidCloseConnection(WebPageProxy&, IPC::Connection&) { }
+    virtual void webProcessDidCloseConnection(WebProcessProxy&, IPC::Connection&) { }
+    virtual void webPageWasRemoved(WebPageProxy&) { }
+
+    HashCountedSet<WebProcessProxy*> m_processes;
+};
+
+}
+
+#endif // WebProcessLifetimeObserver_h