Added a XR shim for XboxOne

Author: Chman

PostProcessing/Runtime/Utils/XRSettings.cs

@@ -0,0 +1,31 @@
+// Small shim for VRSettings/XRSettings on XBOX
+#if UNITY_XBOXONE
+using System;
+
+namespace UnityEngine.XR
+{
+#if UNITY_2017_2_OR_NEWER
+    public static class XRSettings
+#elif UNITY_5_6_OR_NEWER
+    public static class VRSettings
+#endif
+    {
+        public static bool enabled { get; set; }
+        public static bool isDeviceActive { get; private set; }
+        public static bool showDeviceView { get; set; }
+        [Obsolete("renderScale is deprecated, use XRSettings.eyeTextureResolutionScale instead (UnityUpgradable) -> eyeTextureResolutionScale")]
+        public static float renderScale { get; set; }
+        public static float eyeTextureResolutionScale { get; set; }
+        public static int eyeTextureWidth { get; private set; }
+        public static int eyeTextureHeight { get; private set; }
+        public static RenderTextureDescriptor eyeTextureDesc { get; private set; }
+        public static float renderViewportScale { get; set; }
+        public static float occlusionMaskScale { get; set; }
+        public static bool useOcclusionMesh { get; set; }
+        public static string loadedDeviceName { get; private set; }
+        public static string[] supportedDevices { get; private set; }
+        public static void LoadDeviceByName(string deviceName) { }
+        public static void LoadDeviceByName(string[] prioritizedDeviceNameList) { }
+    }
+}
+#endif