MediaSession2Service: Doc notification permission

    public abstract MediaSession2 onGetSession(@NonNull ControllerInfo controllerInfo);

    /**

     * Called when notification UI needs update. Override this method to show or cancel your own

     * notification UI.

     * Called to update the media notification when the playback state changes.

     * <p>

     * This would be called on {@link MediaSession2}'s callback executor when playback state is

     * changed.

     * If playback is active and a notification is returned, the service uses it to become a

     * foreground service. If playback is not active then the notification is still posted, but the

     * service does not become a foreground service.

     * <p>

     * With the notification returned here, the service becomes foreground service when the playback

     * is started. Apps must request the permission

     * {@link android.Manifest.permission#FOREGROUND_SERVICE} in order to use this API. It becomes

     * background service after the playback is stopped.

     * Apps must request the {@link android.Manifest.permission#FOREGROUND_SERVICE} permission

     * in order to use this API. For apps targeting {@link android.os.Build.VERSION_CODES#TIRAMISU}

     * or later, notifications will only be posted if the app has also been granted the

     * {@link android.Manifest.permission#POST_NOTIFICATIONS} permission.

     *

     * @param session a session that needs notification update.

     * @return a {@link MediaNotification}. Can be {@code null}.

     * @param session the session for which an updated media notification is required.

     * @return the {@link MediaNotification}. Can be {@code null}.

     */

    @Nullable

    public abstract MediaNotification onUpdateNotification(@NonNull MediaSession2 session);