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diff --git a/Source/WebKit2/UIProcess/ProcessThrottler.h b/Source/WebKit2/UIProcess/ProcessThrottler.h
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+++ b/Source/WebKit2/UIProcess/ProcessThrottler.h
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+/*
+ * Copyright (C) 2014 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 ProcessThrottler_h
+#define ProcessThrottler_h
+
+#include "ProcessAssertion.h"
+
+#include <wtf/RefCounter.h>
+#include <wtf/RunLoop.h>
+#include <wtf/WeakPtr.h>
+
+namespace WebKit {
+    
+enum UserObservablePageCounterType { };
+typedef RefCounter<UserObservablePageCounterType> UserObservablePageCounter;
+enum ProcessSuppressionDisabledCounterType { };
+typedef RefCounter<ProcessSuppressionDisabledCounterType> ProcessSuppressionDisabledCounter;
+typedef ProcessSuppressionDisabledCounter::Token ProcessSuppressionDisabledToken;
+
+class ProcessThrottlerClient;
+
+class ProcessThrottler : private ProcessAssertionClient {
+public:
+    enum ForegroundActivityCounterType { };
+    typedef RefCounter<ForegroundActivityCounterType> ForegroundActivityCounter;
+    typedef ForegroundActivityCounter::Token ForegroundActivityToken;
+    enum BackgroundActivityCounterType { };
+    typedef RefCounter<BackgroundActivityCounterType> BackgroundActivityCounter;
+    typedef BackgroundActivityCounter::Token BackgroundActivityToken;
+
+    ProcessThrottler(ProcessThrottlerClient&);
+
+    inline ForegroundActivityToken foregroundActivityToken() const;
+    inline BackgroundActivityToken backgroundActivityToken() const;
+    
+    void didConnectToProcess(pid_t);
+    void processReadyToSuspend();
+    void didCancelProcessSuspension();
+
+private:
+    AssertionState assertionState();
+    void updateAssertion();
+    void updateAssertionNow();
+    void suspendTimerFired();
+
+    // ProcessAssertionClient
+    void assertionWillExpireImminently() override;
+
+    ProcessThrottlerClient& m_process;
+    std::unique_ptr<ProcessAndUIAssertion> m_assertion;
+    RunLoop::Timer<ProcessThrottler> m_suspendTimer;
+    ForegroundActivityCounter m_foregroundCounter;
+    BackgroundActivityCounter m_backgroundCounter;
+    int m_suspendMessageCount;
+};
+
+inline ProcessThrottler::ForegroundActivityToken ProcessThrottler::foregroundActivityToken() const
+{
+    return ForegroundActivityToken(m_foregroundCounter.count());
+}
+
+inline ProcessThrottler::BackgroundActivityToken ProcessThrottler::backgroundActivityToken() const
+{
+    return BackgroundActivityToken(m_backgroundCounter.count());
+}
+    
+}
+
+#endif // ProcessThrottler_h