public static MyLib.Coroutine AddRoutine(MyLib.MonoBehaviour behaviour, string methodName, IEnumerator routine)
{
    MyLib.BehaviourData bdata;

    if (behaviourDict.TryGetValue(behaviour, out bdata))
    {
        var coroutine = new MyLib.Coroutine(methodName, routine);
        // ひとまず1回実行
        routine.MoveNext();
        bdata.routineList.AddLast(coroutine);
        return coroutine;
    }
    else
    {
        // ここに来ることはない
        return null;
    }
}