Added stereoRenderingPath to XRGraphicsConfig

com.unity.render-pipelines.core/CoreRP/Common/XRGraphicsConfig.cs

         public float occlusionMaskScale;
         public bool showDeviceView;
         public GameViewRenderMode gameViewRenderMode;
-
+        
         public void SetConfig()
         { // If XR is enabled, sets XRSettings from our saved config
             if (!enabled)
                 return false;
 #endif
             }
-        }        
+        }
+        public static StereoRenderingPath stereoRenderingMode
+        {
+            get
+            {
+                if (!enabled)
+                    Assert.IsFalse(enabled);
+#if UNITY_2018_3_OR_NEWER
+                return (StereoRenderingPath)XRSettings.stereoRenderingMode;
+#else
+                if (eyeTextureDesc.vrUsage == VRTextureUsage.TwoEyes)
+                    return StereoRenderingPath.SinglePass;
+                else if (eyeTextureDesc.dimension == UnityEngine.Rendering.TextureDimension.Tex2DArray)
+                    return StereoRenderingPath.Instancing;
+                else
+                    return StereoRenderingPath.MultiPass;
+#endif
+            }
+        }
         public static RenderTextureDescriptor eyeTextureDesc
         {
             get
                 if (!enabled)
                     Assert.IsFalse(enabled);
                 return XRSettings.eyeTextureHeight;
-            }
-        }
-
-        public static string[] supportedDevices
-        {
-            get
-            {
-                if (!enabled)
-                    Assert.IsFalse(enabled);
-                return XRSettings.supportedDevices;
             }
         }
     }