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diff --git a/Source/WebCore/loader/ResourceLoadObserver.h b/Source/WebCore/loader/ResourceLoadObserver.h
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+++ b/Source/WebCore/loader/ResourceLoadObserver.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 "ResourceLoadStatisticsStore.h"
+#include <wtf/HashMap.h>
+#include <wtf/text/WTFString.h>
+
+namespace WebCore {
+
+class Document;
+class Frame;
+class Page;
+class ResourceRequest;
+class ResourceResponse;
+class URL;
+
+struct ResourceLoadStatistics;
+
+class ResourceLoadObserver {
+    friend class NeverDestroyed<ResourceLoadObserver>;
+public:
+    WEBCORE_EXPORT static ResourceLoadObserver& sharedObserver();
+    
+    void logFrameNavigation(const Frame& frame, const Frame& topFrame, const ResourceRequest& newRequest, const ResourceResponse& redirectResponse);
+    void logSubresourceLoading(const Frame*, const ResourceRequest& newRequest, const ResourceResponse& redirectResponse);
+    void logWebSocketLoading(const Frame*, const URL&);
+    void logUserInteractionWithReducedTimeResolution(const Document&);
+
+    WEBCORE_EXPORT void logUserInteraction(const URL&);
+    WEBCORE_EXPORT bool hasHadUserInteraction(const URL&);
+    WEBCORE_EXPORT void clearUserInteraction(const URL&);
+
+    WEBCORE_EXPORT void setPrevalentResource(const URL&);
+    WEBCORE_EXPORT bool isPrevalentResource(const URL&);
+    WEBCORE_EXPORT void clearPrevalentResource(const URL&);
+
+    WEBCORE_EXPORT void setTimeToLiveUserInteraction(double seconds);
+    WEBCORE_EXPORT void setReducedTimestampResolution(double seconds);
+
+    WEBCORE_EXPORT void fireDataModificationHandler();
+
+    WEBCORE_EXPORT RefPtr<ResourceLoadStatisticsStore> statisticsStore();
+    WEBCORE_EXPORT void setStatisticsStore(Ref<ResourceLoadStatisticsStore>&&);
+
+    WEBCORE_EXPORT String statisticsForOrigin(const String&);
+
+private:
+    bool shouldLog(Page*);
+    static String primaryDomain(const URL&);
+
+    RefPtr<ResourceLoadStatisticsStore> m_store;
+    HashMap<String, size_t> m_originsVisitedMap;
+};
+    
+} // namespace WebCore