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diff --git a/Source/WebCore/loader/ResourceTiming.h b/Source/WebCore/loader/ResourceTiming.h
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+++ b/Source/WebCore/loader/ResourceTiming.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 "LoadTiming.h"
+#include "NetworkLoadTiming.h"
+#include "URL.h"
+
+namespace WebCore {
+
+class CachedResource;
+class ResourceResponse;
+class SecurityOrigin;
+
+class ResourceTiming {
+    WTF_MAKE_FAST_ALLOCATED;
+public:
+    static ResourceTiming fromCache(const URL&, const String& initiator, const LoadTiming&);
+    static ResourceTiming fromLoad(CachedResource&, const String& initiator, const LoadTiming&, const SecurityOrigin&);
+    static ResourceTiming fromSynchronousLoad(const URL&, const String& initiator, const LoadTiming&, const NetworkLoadTiming&, const ResourceResponse&, const SecurityOrigin&);
+
+    URL url() const { return m_url; }
+    String initiator() const { return m_initiator; }
+    LoadTiming loadTiming() const { return m_loadTiming; }
+    NetworkLoadTiming networkLoadTiming() const { return m_networkLoadTiming; }
+    bool allowTimingDetails() const { return m_allowTimingDetails; }
+
+    ResourceTiming isolatedCopy() const;
+
+    void overrideInitiatorName(const String& name) { m_initiator = name; }
+
+private:
+    ResourceTiming(CachedResource&, const String& initiator, const LoadTiming&, const SecurityOrigin&);
+    ResourceTiming(const URL&, const String& initiator, const LoadTiming&, const NetworkLoadTiming&, const ResourceResponse&, const SecurityOrigin&);
+    ResourceTiming(const URL&, const String& initiator, const LoadTiming&);
+    ResourceTiming(const URL& url, const String& initiator, const LoadTiming& loadTiming, const NetworkLoadTiming& networkLoadTiming, bool allowTimingDetails)
+        : m_url(url)
+        , m_initiator(initiator)
+        , m_loadTiming(loadTiming)
+        , m_networkLoadTiming(networkLoadTiming)
+        , m_allowTimingDetails(allowTimingDetails)
+    {
+    }
+
+    URL m_url;
+    String m_initiator;
+    LoadTiming m_loadTiming;
+    NetworkLoadTiming m_networkLoadTiming;
+    bool m_allowTimingDetails { false };
+};
+
+} // namespace WebCore