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diff --git a/Source/WebKit2/UIProcess/PerActivityStateCPUUsageSampler.cpp b/Source/WebKit2/UIProcess/PerActivityStateCPUUsageSampler.cpp
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+++ b/Source/WebKit2/UIProcess/PerActivityStateCPUUsageSampler.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 "PerActivityStateCPUUsageSampler.h"
+
+#include "Logging.h"
+#include "WebProcessPool.h"
+#include "WebProcessProxy.h"
+#include <WebCore/DiagnosticLoggingKeys.h>
+#include <wtf/DecimalNumber.h>
+
+namespace WebKit {
+
+static const int64_t microsecondsPerSecond = 1000000;
+
+using namespace WebCore;
+
+static const std::chrono::minutes loggingInterval { 60 };
+
+PerActivityStateCPUUsageSampler::PerActivityStateCPUUsageSampler(WebProcessPool& processPool)
+    : m_processPool(processPool)
+    , m_loggingTimer(RunLoop::main(), this, &PerActivityStateCPUUsageSampler::loggingTimerFired)
+{
+    m_lastCPUTime = monotonicallyIncreasingTime();
+    m_loggingTimer.startRepeating(loggingInterval);
+}
+
+PerActivityStateCPUUsageSampler::~PerActivityStateCPUUsageSampler()
+{
+}
+
+void PerActivityStateCPUUsageSampler::reportWebContentCPUTime(int64_t cpuTime, ActivityStateForCPUSampling activityState)
+{
+    auto result = m_cpuTimeInActivityState.add(activityState, cpuTime);
+    if (!result.isNewEntry)
+        result.iterator->value += cpuTime;
+}
+
+static inline String loggingKeyForActivityState(ActivityStateForCPUSampling state)
+{
+    switch (state) {
+    case ActivityStateForCPUSampling::NonVisible:
+        return DiagnosticLoggingKeys::nonVisibleStateKey();
+    case ActivityStateForCPUSampling::VisibleNonActive:
+        return DiagnosticLoggingKeys::visibleNonActiveStateKey();
+    case ActivityStateForCPUSampling::VisibleAndActive:
+        return DiagnosticLoggingKeys::visibleAndActiveStateKey();
+    }
+}
+
+void PerActivityStateCPUUsageSampler::loggingTimerFired()
+{
+    auto* page = pageForLogging();
+    if (!page) {
+        m_cpuTimeInActivityState.clear();
+        return;
+    }
+
+    double currentCPUTime = monotonicallyIncreasingTime();
+    int64_t cpuTimeDelta = (currentCPUTime - m_lastCPUTime) * microsecondsPerSecond;
+
+    for (auto& pair : m_cpuTimeInActivityState) {
+        double cpuUsage = static_cast<double>(pair.value * 100.) / cpuTimeDelta;
+        String activityStateKey = loggingKeyForActivityState(pair.key);
+        page->logDiagnosticMessageWithValue(DiagnosticLoggingKeys::cpuUsageKey(), activityStateKey, cpuUsage, 2, ShouldSample::No);
+        RELEASE_LOG(PerformanceLogging, "WebContent processes used %.1f%% CPU in %s state", cpuUsage, activityStateKey.utf8().data());
+    }
+
+    m_cpuTimeInActivityState.clear();
+    m_lastCPUTime = currentCPUTime;
+}
+
+WebPageProxy* PerActivityStateCPUUsageSampler::pageForLogging() const
+{
+    for (auto& webProcess : m_processPool.processes()) {
+        if (!webProcess->pageCount())
+            continue;
+        return *webProcess->pages().begin();
+    }
+    return nullptr;
+}
+
+} // namespace WebKit