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diff --git a/Source/WebCore/Modules/mediasession/MediaSessionManager.h b/Source/WebCore/Modules/mediasession/MediaSessionManager.h
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+++ b/Source/WebCore/Modules/mediasession/MediaSessionManager.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 "MediaSessionInterruptionProvider.h"
+#include <wtf/HashSet.h>
+#include <wtf/NeverDestroyed.h>
+
+namespace WebCore {
+
+class MediaSession;
+
+class MediaSessionManager : public MediaSessionInterruptionProviderClient {
+    friend class NeverDestroyed<MediaSessionManager>;
+public:
+    WEBCORE_EXPORT static MediaSessionManager& singleton();
+
+    WEBCORE_EXPORT void togglePlayback();
+    WEBCORE_EXPORT void skipToNextTrack();
+    WEBCORE_EXPORT void skipToPreviousTrack();
+
+    WEBCORE_EXPORT void didReceiveStartOfInterruptionNotification(MediaSessionInterruptingCategory) override;
+    WEBCORE_EXPORT void didReceiveEndOfInterruptionNotification(MediaSessionInterruptingCategory) override;
+
+private:
+    friend class MediaSession;
+
+    MediaSessionManager();
+
+    bool hasActiveMediaElements() const;
+
+    void addMediaSession(MediaSession&);
+    void removeMediaSession(MediaSession&);
+
+    RefPtr<MediaSessionInterruptionProvider> m_interruptionProvider;
+    HashSet<MediaSession*> m_sessions;
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(MEDIA_SESSION)