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diff --git a/Source/WebKit2/UIProcess/UnresponsiveWebProcessTerminator.cpp b/Source/WebKit2/UIProcess/UnresponsiveWebProcessTerminator.cpp
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+++ b/Source/WebKit2/UIProcess/UnresponsiveWebProcessTerminator.cpp
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+/*
+ * Copyright (C) 2017 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 "UnresponsiveWebProcessTerminator.h"
+
+#include "Logging.h"
+
+namespace WebKit {
+
+static const std::chrono::seconds initialInterval { 20s };
+static const std::chrono::seconds maximumInterval { 8h };
+
+UnresponsiveWebProcessTerminator::UnresponsiveWebProcessTerminator(WebProcessProxy& webProcessProxy)
+    : m_webProcessProxy(webProcessProxy)
+    , m_interval(initialInterval)
+    , m_timer(RunLoop::main(), this, &UnresponsiveWebProcessTerminator::timerFired)
+{
+}
+
+void UnresponsiveWebProcessTerminator::updateState()
+{
+    if (!shouldBeActive()) {
+        if (m_timer.isActive()) {
+            m_interval = initialInterval;
+            m_timer.stop();
+        }
+        return;
+    }
+
+    if (!m_timer.isActive())
+        m_timer.startOneShot(m_interval);
+}
+
+static Vector<RefPtr<WebPageProxy>> pagesCopy(WTF::IteratorRange<WebProcessProxy::WebPageProxyMap::const_iterator::Values> pages)
+{
+    Vector<RefPtr<WebPageProxy>> vector;
+    for (auto& page : pages)
+        vector.append(page);
+    return vector;
+}
+
+void UnresponsiveWebProcessTerminator::timerFired()
+{
+    ASSERT(shouldBeActive());
+    m_webProcessProxy.isResponsive([this](bool processIsResponsive) {
+        if (processIsResponsive) {
+            // Exponential backoff to avoid waking up the process too often.
+            m_interval = std::min(m_interval * 2, maximumInterval);
+            m_timer.startOneShot(m_interval);
+            return;
+        }
+
+        RELEASE_LOG_ERROR(PerformanceLogging, "Killing a background WebProcess because it is not responsive");
+        for (auto& page : pagesCopy(m_webProcessProxy.pages()))
+            page->terminateProcess(WebPageProxy::TerminationReason::UnresponsiveWhileInBackground);
+    });
+}
+
+} // namespace WebKit