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diff --git a/Source/WebCore/loader/ResourceLoadStatisticsStore.h b/Source/WebCore/loader/ResourceLoadStatisticsStore.h
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+++ b/Source/WebCore/loader/ResourceLoadStatisticsStore.h
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+/*
+ * Copyright (C) 2016-2017 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. ``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
+ * 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 "ResourceLoadStatistics.h"
+
+namespace WebCore {
+
+class KeyedDecoder;
+class KeyedEncoder;
+class URL;
+
+struct ResourceLoadStatistics;
+
+class ResourceLoadStatisticsStore : public RefCounted<ResourceLoadStatisticsStore> {
+public:
+    WEBCORE_EXPORT static Ref<ResourceLoadStatisticsStore> create();
+
+    WEBCORE_EXPORT std::unique_ptr<KeyedEncoder> createEncoderFromData();
+    WEBCORE_EXPORT void readDataFromDecoder(KeyedDecoder&);
+
+    WEBCORE_EXPORT String statisticsForOrigin(const String&);
+
+    bool isEmpty() const { return m_resourceStatisticsMap.isEmpty(); }
+    size_t size() const { return m_resourceStatisticsMap.size(); }
+    void clear() { m_resourceStatisticsMap.clear(); }
+
+    ResourceLoadStatistics& ensureResourceStatisticsForPrimaryDomain(const String&);
+    void setResourceStatisticsForPrimaryDomain(const String&, ResourceLoadStatistics&&);
+
+    bool isPrevalentResource(const String&) const;
+    
+    WEBCORE_EXPORT void mergeStatistics(const Vector<ResourceLoadStatistics>&);
+    WEBCORE_EXPORT Vector<ResourceLoadStatistics> takeStatistics();
+
+    WEBCORE_EXPORT void setNotificationCallback(std::function<void()> handler);
+
+    void fireDataModificationHandler();
+    void setTimeToLiveUserInteraction(double seconds);
+
+    WEBCORE_EXPORT void processStatistics(std::function<void(ResourceLoadStatistics&)>&&);
+
+    WEBCORE_EXPORT bool hasHadRecentUserInteraction(ResourceLoadStatistics&);
+    WEBCORE_EXPORT Vector<String> prevalentResourceDomainsWithoutUserInteraction();
+    WEBCORE_EXPORT void updateStatisticsForRemovedDataRecords(const Vector<String>& prevalentResourceDomains);
+private:
+    ResourceLoadStatisticsStore() = default;
+
+    HashMap<String, ResourceLoadStatistics> m_resourceStatisticsMap;
+    std::function<void()> m_dataAddedHandler;
+};
+    
+} // namespace WebCore