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diff --git a/Source/WebCore/page/PerformanceObserver.h b/Source/WebCore/page/PerformanceObserver.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
+
+#if ENABLE(WEB_TIMING)
+
+#include "ExceptionOr.h"
+#include "PerformanceEntry.h"
+#include "PerformanceObserverCallback.h"
+#include <wtf/OptionSet.h>
+#include <wtf/RefCounted.h>
+#include <wtf/Vector.h>
+#include <wtf/text/WTFString.h>
+
+namespace WebCore {
+
+class Performance;
+class ScriptExecutionContext;
+
+class PerformanceObserver : public RefCounted<PerformanceObserver> {
+public:
+    struct Init {
+        Vector<String> entryTypes;
+    };
+
+    static Ref<PerformanceObserver> create(ScriptExecutionContext& context, Ref<PerformanceObserverCallback>&& callback)
+    {
+        return adoptRef(*new PerformanceObserver(context, WTFMove(callback)));
+    }
+
+    ExceptionOr<void> observe(Init&&);
+    void disconnect();
+
+    OptionSet<PerformanceEntry::Type> typeFilter() const { return m_typeFilter; }
+
+    void queueEntry(PerformanceEntry&);
+    void deliver();
+
+private:
+    PerformanceObserver(ScriptExecutionContext&, Ref<PerformanceObserverCallback>&&);
+
+    RefPtr<Performance> m_performance;
+    Vector<RefPtr<PerformanceEntry>> m_entriesToDeliver;
+    Ref<PerformanceObserverCallback> m_callback;
+    OptionSet<PerformanceEntry::Type> m_typeFilter;
+    bool m_registered { false };
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(WEB_TIMING)