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messages -> UserMediaCaptureManagerProxy {
    CreateMediaSourceForCaptureDeviceWithConstraints(uint64_t id, String deviceID, WebCore::RealtimeMediaSource::Type type, struct WebCore::MediaConstraints constraints) -> (bool success, String invalidConstraints, WebCore::RealtimeMediaSourceSettings settings)
    StartProducingData(uint64_t id)
    StopProducingData(uint64_t id)
    Capabilities(uint64_t id) -> (WebCore::RealtimeMediaSourceCapabilities capabilities)
    SetMuted(uint64_t id, bool muted)
    ApplyConstraints(uint64_t id, struct WebCore::MediaConstraints constraints)
}