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diff --git a/Source/WebCore/Modules/mediasession/WebMediaSessionManager.h b/Source/WebCore/Modules/mediasession/WebMediaSessionManager.h
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+++ b/Source/WebCore/Modules/mediasession/WebMediaSessionManager.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. AND ITS 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 APPLE INC. OR ITS 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(WIRELESS_PLAYBACK_TARGET) && !PLATFORM(IOS)
+
+#include "MediaPlaybackTargetContext.h"
+#include "MediaPlaybackTargetPicker.h"
+#include "MediaPlaybackTargetPickerMock.h"
+#include "MediaProducer.h"
+#include "Timer.h"
+#include <wtf/Ref.h>
+#include <wtf/RefPtr.h>
+#include <wtf/RunLoop.h>
+
+namespace WebCore {
+
+struct ClientState;
+class IntRect;
+class WebMediaSessionManagerClient;
+
+class WebMediaSessionManager : public MediaPlaybackTargetPicker::Client {
+    WTF_MAKE_NONCOPYABLE(WebMediaSessionManager);
+public:
+
+    WEBCORE_EXPORT static WebMediaSessionManager& shared();
+
+    WEBCORE_EXPORT void setMockMediaPlaybackTargetPickerEnabled(bool);
+    WEBCORE_EXPORT void setMockMediaPlaybackTargetPickerState(const String&, MediaPlaybackTargetContext::State);
+
+    WEBCORE_EXPORT uint64_t addPlaybackTargetPickerClient(WebMediaSessionManagerClient&, uint64_t);
+    WEBCORE_EXPORT void removePlaybackTargetPickerClient(WebMediaSessionManagerClient&, uint64_t);
+    WEBCORE_EXPORT void removeAllPlaybackTargetPickerClients(WebMediaSessionManagerClient&);
+    WEBCORE_EXPORT void showPlaybackTargetPicker(WebMediaSessionManagerClient&, uint64_t, const IntRect&, bool);
+    WEBCORE_EXPORT void clientStateDidChange(WebMediaSessionManagerClient&, uint64_t, WebCore::MediaProducer::MediaStateFlags);
+
+protected:
+    WebMediaSessionManager();
+    virtual ~WebMediaSessionManager();
+
+    virtual WebCore::MediaPlaybackTargetPicker& platformPicker() = 0;
+    static WebMediaSessionManager& platformManager();
+
+private:
+
+    WebCore::MediaPlaybackTargetPicker& targetPicker();
+    WebCore::MediaPlaybackTargetPickerMock& mockPicker();
+
+    // MediaPlaybackTargetPicker::Client
+    void setPlaybackTarget(Ref<WebCore::MediaPlaybackTarget>&&) override;
+    void externalOutputDeviceAvailableDidChange(bool) override;
+
+    size_t find(WebMediaSessionManagerClient*, uint64_t);
+
+    void configurePlaybackTargetClients();
+    void configureNewClients();
+    void configurePlaybackTargetMonitoring();
+    void configureWatchdogTimer();
+
+    enum ConfigurationTaskFlags {
+        NoTask = 0,
+        InitialConfigurationTask = 1 << 0,
+        TargetClientsConfigurationTask = 1 << 1,
+        TargetMonitoringConfigurationTask = 1 << 2,
+        WatchdogTimerConfigurationTask = 1 << 3,
+    };
+    typedef unsigned ConfigurationTasks;
+    String toString(ConfigurationTasks);
+
+    void scheduleDelayedTask(ConfigurationTasks);
+    void taskTimerFired();
+
+    void watchdogTimerFired();
+
+    RunLoop::Timer<WebMediaSessionManager> m_taskTimer;
+    RunLoop::Timer<WebMediaSessionManager> m_watchdogTimer;
+
+    Vector<std::unique_ptr<ClientState>> m_clientState;
+    RefPtr<MediaPlaybackTarget> m_playbackTarget;
+    std::unique_ptr<WebCore::MediaPlaybackTargetPickerMock> m_pickerOverride;
+    ConfigurationTasks m_taskFlags { NoTask };
+    double m_currentWatchdogInterval { 0 };
+    bool m_externalOutputDeviceAvailable { false };
+    bool m_targetChanged { false };
+    bool m_mockPickerEnabled { false };
+};
+
+} // namespace WebCore
+
+#endif // ENABLE(WIRELESS_PLAYBACK_TARGET) && !PLATFORM(IOS)