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diff --git a/Source/WebCore/page/PerformanceMonitor.h b/Source/WebCore/page/PerformanceMonitor.h
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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.
+ */
+
+#pragma once
+
+#include "ActivityState.h"
+#include "CPUTime.h"
+#include "Timer.h"
+#include <wtf/Optional.h>
+
+namespace WebCore {
+
+class Page;
+
+class PerformanceMonitor {
+public:
+    explicit PerformanceMonitor(Page&);
+
+    void didStartProvisionalLoad();
+    void didFinishLoad();
+    void activityStateChanged(ActivityState::Flags oldState, ActivityState::Flags newState);
+
+private:
+    void measurePostLoadCPUUsage();
+    void measurePostBackgroundingCPUUsage();
+    void measurePerActivityStateCPUUsage();
+    void measureCPUUsageInActivityState(ActivityStateForCPUSampling);
+
+    void measurePostLoadMemoryUsage();
+    void measurePostBackgroundingMemoryUsage();
+
+    Page& m_page;
+
+    Timer m_postPageLoadCPUUsageTimer;
+    std::optional<CPUTime> m_postLoadCPUTime;
+    Timer m_postBackgroundingCPUUsageTimer;
+    std::optional<CPUTime> m_postBackgroundingCPUTime;
+    Timer m_perActivityStateCPUUsageTimer;
+    std::optional<CPUTime> m_perActivityStateCPUTime;
+
+    Timer m_postPageLoadMemoryUsageTimer;
+    Timer m_postBackgroundingMemoryUsageTimer;
+};
+
+}