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diff --git a/Source/WebCore/replay/FunctorInputCursor.h b/Source/WebCore/replay/FunctorInputCursor.h
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+++ b/Source/WebCore/replay/FunctorInputCursor.h
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+/*
+ * Copyright (C) 2013 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 "ReplaySessionSegment.h"
+#include "SegmentedInputStorage.h"
+#include <replay/InputCursor.h>
+#include <replay/NondeterministicInput.h>
+#include <wtf/Assertions.h>
+#include <wtf/Noncopyable.h>
+
+namespace WebCore {
+
+class FunctorInputCursor final : public InputCursor {
+    WTF_MAKE_NONCOPYABLE(FunctorInputCursor);
+public:
+    static Ref<FunctorInputCursor> create(RefPtr<ReplaySessionSegment>&& segment)
+    {
+        return adoptRef(*new FunctorInputCursor(WTFMove(segment)));
+    }
+
+    // InputCursor
+    bool isCapturing() const override { return false; }
+    bool isReplaying() const override { return false; }
+
+    void storeInput(std::unique_ptr<NondeterministicInputBase>) override;
+    NondeterministicInputBase* uncheckedLoadInput(InputQueue) override;
+
+    template<typename Functor>
+    typename Functor::ReturnType forEachInputInQueue(InputQueue, Functor&);
+protected:
+    NondeterministicInputBase* loadInput(InputQueue, const String&) override;
+private:
+    FunctorInputCursor(RefPtr<ReplaySessionSegment>&&);
+
+    RefPtr<ReplaySessionSegment> m_segment;
+};
+
+template<typename Functor> inline
+typename Functor::ReturnType FunctorInputCursor::forEachInputInQueue(InputQueue queue, Functor& functor)
+{
+    for (size_t i = 0; i < m_segment->storage().queueSize(queue); i++)
+        functor(i, m_segment->storage().queue(queue).at(i).get());
+
+    return functor.returnValue();
+}
+
+inline FunctorInputCursor::FunctorInputCursor(RefPtr<ReplaySessionSegment>&& segment)
+    : m_segment(WTFMove(segment))
+{
+}
+
+inline void FunctorInputCursor::storeInput(std::unique_ptr<NondeterministicInputBase>)
+{
+    ASSERT_NOT_REACHED();
+}
+
+inline NondeterministicInputBase* FunctorInputCursor::loadInput(InputQueue, const String&)
+{
+    ASSERT_NOT_REACHED();
+    return nullptr;
+}
+
+inline NondeterministicInputBase* FunctorInputCursor::uncheckedLoadInput(InputQueue)
+{
+    ASSERT_NOT_REACHED();
+    return nullptr;
+}
+
+} // namespace WebCore
+
+#endif // ENABLE(WEB_REPLAY)