ScriptableRenderPipeline/com.unity.render-pipelines.lightweight/LWRP/Passes/BeginXRRenderingPass.cs

namespace UnityEngine.Experimental.Rendering.LightweightPipeline
{
    public class BeginXRRenderingPass : ScriptableRenderPass
    {
        public override void Execute(LightweightForwardRenderer renderer, ref ScriptableRenderContext context,
            ref CullResults cullResults,
            ref RenderingData renderingData)
        {
            Camera camera = renderingData.cameraData.camera;
            context.StartMultiEye(camera);
        }
    }
}