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diff --git a/Source/WebKit2/UIProcess/WebProcessLifetimeObserver.cpp b/Source/WebKit2/UIProcess/WebProcessLifetimeObserver.cpp
new file mode 100644
index 000000000..c36474f2b
--- /dev/null
+++ b/Source/WebKit2/UIProcess/WebProcessLifetimeObserver.cpp
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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.
+ */
+
+#include "config.h"
+#include "WebProcessLifetimeObserver.h"
+
+#include "WebPageProxy.h"
+#include "WebProcessProxy.h"
+
+namespace WebKit {
+
+WebProcessLifetimeObserver::WebProcessLifetimeObserver()
+{
+}
+
+WebProcessLifetimeObserver::~WebProcessLifetimeObserver()
+{
+}
+
+void WebProcessLifetimeObserver::addWebPage(WebPageProxy& webPageProxy)
+{
+    auto& process = webPageProxy.process();
+
+    ASSERT(process.state() == WebProcessProxy::State::Running);
+
+    if (m_processes.add(&process).isNewEntry)
+        webProcessWillOpenConnection(process, *process.connection());
+
+    webPageWillOpenConnection(webPageProxy, *process.connection());
+}
+
+void WebProcessLifetimeObserver::removeWebPage(WebPageProxy& webPageProxy)
+{
+    auto& process = webPageProxy.process();
+
+    // FIXME: This should assert that the page is either closed or that the process is no longer running,
+    // but we have to make sure that removeWebPage is called after the connection has been removed in that case.
+    ASSERT(m_processes.contains(&process));
+
+    webPageDidCloseConnection(webPageProxy, *process.connection());
+
+    if (m_processes.remove(&process))
+        webProcessDidCloseConnection(process, *process.connection());
+}
+
+WTF::IteratorRange<HashCountedSet<WebProcessProxy*>::const_iterator::Keys> WebProcessLifetimeObserver::processes() const
+{
+    ASSERT(std::all_of(m_processes.begin().keys(), m_processes.end().keys(), [](WebProcessProxy* process) {
+        return process->state() == WebProcessProxy::State::Running;
+    }));
+
+    return makeIteratorRange(m_processes.begin().keys(), m_processes.end().keys());
+}
+
+}