ScriptableRenderPipeline/com.unity.render-pipelines.core/CoreRP/Textures/MSAASamples.cs

using System.Collections.Generic;
using UnityEngine.Rendering;

namespace UnityEngine.Experimental.Rendering
{
    public enum MSAASamples
    {
        None = 1,
        MSAA2x = 2,
        MSAA4x = 4,
        MSAA8x = 8
    }
}