UnityEditor.GameViewSizeGroup.AddCustomSize C# (CSharp) Method

        public void AddCustomSize(GameViewSize size)
        {
            this.m_Custom.Add(size);
            ScriptableSingleton<GameViewSizes>.instance.Changed();
        }

        public int Add(object obj)
        {
            GameViewSize gameViewSize = CastToGameViewSize(obj);

            if (gameViewSize == null)
            {
                return(-1);
            }

            m_GameViewSizeGroup.AddCustomSize(gameViewSize);
            GameViewSizes.instance.SaveToHDD();
            return(Count() - 1); // assumes that custom sizes is after builtin sizes
        }