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diff --git a/Source/JavaScriptCore/replay/NondeterministicInput.h b/Source/JavaScriptCore/replay/NondeterministicInput.h
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+++ b/Source/JavaScriptCore/replay/NondeterministicInput.h
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+/*
+ * Copyright (C) 2011, 2012 University of Washington. All rights reserved.
+ * Copyright (C) 2014 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 THE COPYRIGHT HOLDERS AND 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 THE COPYRIGHT
+ * HOLDER 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
+
+#if ENABLE(WEB_REPLAY)
+
+#include <wtf/Forward.h>
+#include <wtf/Noncopyable.h>
+
+namespace JSC {
+
+class EncodedValue;
+
+enum class InputQueue {
+    ScriptMemoizedData = 0,
+    LoaderMemoizedData = 1,
+    EventLoopInput = 2,
+    Count = 3
+};
+
+template<typename InputType>
+struct JS_EXPORT_PRIVATE InputTraits {
+    static InputQueue queue();
+    static String& type();
+
+    static void encode(EncodedValue& encodedInput, InputType& decodedInput);
+    static bool decode(EncodedValue& encodedInput, std::unique_ptr<InputType>& decodedInput);
+};
+
+class NondeterministicInputBase {
+    WTF_MAKE_NONCOPYABLE(NondeterministicInputBase);
+public:
+    NondeterministicInputBase() { }
+    virtual ~NondeterministicInputBase() { }
+
+    virtual const String& type() const = 0;
+    virtual InputQueue queue() const = 0;
+};
+
+template<typename InputType>
+class NondeterministicInput : public NondeterministicInputBase {
+public:
+    const String& type() const override
+    {
+        return InputTraits<InputType>::type();
+    }
+
+    InputQueue queue() const override
+    {
+        return InputTraits<InputType>::queue();
+    }
+};
+
+} // namespace JSC
+
+using JSC::InputQueue;
+using JSC::InputTraits;
+using JSC::NondeterministicInput;
+using JSC::NondeterministicInputBase;
+
+#endif // ENABLE(WEB_REPLAY)