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diff --git a/Source/WebCore/Modules/mediasession/MediaSession.h b/Source/WebCore/Modules/mediasession/MediaSession.h
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index 000000000..fb2b6d1ea
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+++ b/Source/WebCore/Modules/mediasession/MediaSession.h
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+/*
+ * Copyright (C) 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 APPLE INC. ``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
+ * 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(MEDIA_SESSION)
+
+#include "MediaRemoteControls.h"
+#include "MediaSessionMetadata.h"
+#include <wtf/HashSet.h>
+
+namespace WebCore {
+
+class Document;
+class HTMLMediaElement;
+
+class MediaSession final : public RefCounted<MediaSession> {
+public:
+    enum class Kind { Content, Transient, TransientSolo, Ambient };
+    enum class State { Idle, Active, Interrupted };
+
+    struct Metadata {
+        String title;
+        String artist;
+        String album;
+        String artwork;
+    };
+
+    static Ref<MediaSession> create(Document& document, Kind kind)
+    {
+        return adoptRef(*new MediaSession(document, kind));
+    }
+
+    ~MediaSession();
+
+    Kind kind() const { return m_kind; }
+    MediaRemoteControls* controls();
+
+    WEBCORE_EXPORT State currentState() const { return m_currentState; }
+    bool hasActiveMediaElements() const;
+
+    void setMetadata(const std::optional<Metadata>&);
+
+    void deactivate();
+
+    // Runs the media session invocation algorithm and returns true on success.
+    bool invoke();
+
+    void handleDuckInterruption();
+    void handleIndefinitePauseInterruption();
+    void handlePauseInterruption();
+    void handleUnduckInterruption();
+    void handleUnpauseInterruption();
+
+    void togglePlayback();
+    void skipToNextTrack();
+    void skipToPreviousTrack();
+
+    void controlIsEnabledDidChange();
+
+private:
+    friend class HTMLMediaElement;
+
+    MediaSession(Document&, Kind);
+
+    void addMediaElement(HTMLMediaElement&);
+    void removeMediaElement(HTMLMediaElement&);
+
+    void safelyIterateActiveMediaElements(std::function<void(HTMLMediaElement*)>);
+    void changeActiveMediaElements(std::function<void(void)>);
+    void addActiveMediaElement(HTMLMediaElement&);
+    bool isMediaElementActive(HTMLMediaElement&);
+
+    void releaseInternal();
+
+    State m_currentState { State::Idle };
+    HashSet<HTMLMediaElement*> m_participatingElements;
+    HashSet<HTMLMediaElement*> m_activeParticipatingElements;
+    HashSet<HTMLMediaElement*>* m_iteratedActiveParticipatingElements { nullptr };
+
+    Document& m_document;
+    const Kind m_kind;
+    RefPtr<MediaRemoteControls> m_controls;
+    MediaSessionMetadata m_metadata;
+};
+
+} // namespace WebCore
+
+#endif /* ENABLE(MEDIA_SESSION) */