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diff --git a/Source/WebCore/inspector/InspectorReplayAgent.h b/Source/WebCore/inspector/InspectorReplayAgent.h
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+++ b/Source/WebCore/inspector/InspectorReplayAgent.h
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+/*
+ * Copyright (C) 2011-2013 University of Washington. All rights reserved.
+ * Copyright (C) 2014, 2015 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 "InspectorWebAgentBase.h"
+#include <inspector/InspectorBackendDispatchers.h>
+#include <inspector/InspectorFrontendDispatchers.h>
+#include <wtf/Forward.h>
+#include <wtf/HashMap.h>
+#include <wtf/Noncopyable.h>
+
+namespace WebCore {
+
+class DocumentLoader;
+class Event;
+class Frame;
+class Page;
+class ReplaySession;
+class ReplaySessionSegment;
+
+enum class SessionState;
+
+struct ReplayPosition;
+
+typedef String ErrorString;
+typedef int SessionIdentifier;
+typedef int SegmentIdentifier;
+
+class InspectorReplayAgent final
+    : public InspectorAgentBase
+    , public Inspector::ReplayBackendDispatcherHandler {
+    WTF_MAKE_FAST_ALLOCATED;
+    WTF_MAKE_NONCOPYABLE(InspectorReplayAgent);
+public:
+    InspectorReplayAgent(PageAgentContext&);
+    virtual ~InspectorReplayAgent();
+
+    void didCreateFrontendAndBackend(Inspector::FrontendRouter*, Inspector::BackendDispatcher*) override;
+    void willDestroyFrontendAndBackend(Inspector::DisconnectReason) override;
+
+    // InspectorInstrumentation
+    void frameNavigated(Frame&);
+    void frameDetached(Frame&);
+    void willDispatchEvent(const Event&, Frame*);
+
+    // Notifications from ReplayController.
+    void sessionCreated(RefPtr<ReplaySession>&&);
+    // This is called internally (when adding/removing) and by ReplayController during capture.
+    void sessionModified(RefPtr<ReplaySession>&&);
+    void sessionLoaded(RefPtr<ReplaySession>&&);
+
+    void segmentCreated(RefPtr<ReplaySessionSegment>&&);
+    void segmentCompleted(RefPtr<ReplaySessionSegment>&&);
+    void segmentLoaded(RefPtr<ReplaySessionSegment>&&);
+    void segmentUnloaded();
+
+    void captureStarted();
+    void captureStopped();
+
+    void playbackStarted();
+    void playbackPaused(const ReplayPosition&);
+    void playbackHitPosition(const ReplayPosition&);
+    void playbackFinished();
+
+    // Calls from the Inspector frontend.
+    void startCapturing(ErrorString&) override;
+    void stopCapturing(ErrorString&) override;
+
+    void replayToPosition(ErrorString&, const Inspector::InspectorObject& position, bool shouldFastForward) override;
+    void replayToCompletion(ErrorString&, bool shouldFastForward) override;
+    void pausePlayback(ErrorString&) override;
+    void cancelPlayback(ErrorString&) override;
+
+    void switchSession(ErrorString&, SessionIdentifier) override;
+    void insertSessionSegment(ErrorString&, Inspector::Protocol::Replay::SessionIdentifier, Inspector::Protocol::Replay::SegmentIdentifier, int segmentIndex) override;
+    void removeSessionSegment(ErrorString&, Inspector::Protocol::Replay::SessionIdentifier, int segmentIndex) override;
+
+    void currentReplayState(ErrorString&, Inspector::Protocol::Replay::SessionIdentifier*, Inspector::Protocol::OptOutput<Inspector::Protocol::Replay::SegmentIdentifier>*, Inspector::Protocol::Replay::SessionState*, Inspector::Protocol::Replay::SegmentState* segmentState, RefPtr<Inspector::Protocol::Replay::ReplayPosition>&) override;
+    void getAvailableSessions(ErrorString&, RefPtr<Inspector::Protocol::Array<Inspector::Protocol::Replay::SessionIdentifier>>&) override;
+    void getSessionData(ErrorString&, Inspector::Protocol::Replay::SessionIdentifier, RefPtr<Inspector::Protocol::Replay::ReplaySession>&) override;
+    void getSegmentData(ErrorString&, Inspector::Protocol::Replay::SegmentIdentifier, RefPtr<Inspector::Protocol::Replay::SessionSegment>&) override;
+
+private:
+    RefPtr<ReplaySession> findSession(ErrorString&, SessionIdentifier);
+    RefPtr<ReplaySessionSegment> findSegment(ErrorString&, SegmentIdentifier);
+    WebCore::SessionState sessionState() const;
+
+    std::unique_ptr<Inspector::ReplayFrontendDispatcher> m_frontendDispatcher;
+    RefPtr<Inspector::ReplayBackendDispatcher> m_backendDispatcher;
+    Page& m_page;
+
+    HashMap<int, RefPtr<ReplaySession>, WTF::IntHash<int>, WTF::UnsignedWithZeroKeyHashTraits<int>> m_sessionsMap;
+    HashMap<int, RefPtr<ReplaySessionSegment>, WTF::IntHash<int>, WTF::UnsignedWithZeroKeyHashTraits<int>> m_segmentsMap;
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(WEB_REPLAY)