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diff --git a/js/public/friend/XrayJitInfo.h b/js/public/friend/XrayJitInfo.h
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+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+ * vim: set ts=8 sts=2 et sw=2 tw=80:
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * JIT info so SpiderMonkey can efficiently work with Gecko XrayWrapper
+ * instances.
+ *
+ * This header is completely irrelevant to non-Gecko embedders.
+ */
+
+#ifndef js_friend_XrayJitInfo_h
+#define js_friend_XrayJitInfo_h
+
+#include <stddef.h>  // size_t
+
+#include "jstypes.h"  // JS_FRIEND_API, JS_PUBLIC_API
+
+class JS_PUBLIC_API JSObject;
+
+namespace js {
+
+class JS_FRIEND_API BaseProxyHandler;
+
+}  // namespace js
+
+namespace JS {
+
+// Callbacks and other information for use by the JITs when optimizing accesses
+// on xray wrappers.
+struct XrayJitInfo {
+  // Test whether a proxy handler is a cross compartment xray with no
+  // security checks.
+  bool (*isCrossCompartmentXray)(const js::BaseProxyHandler* handler);
+
+  // Test whether xrays in |obj|'s compartment have expandos of their own,
+  // instead of sharing them with Xrays from other compartments.
+  bool (*compartmentHasExclusiveExpandos)(JSObject* obj);
+
+  // Proxy reserved slot used by xrays in sandboxes to store their holder
+  // object.
+  size_t xrayHolderSlot;
+
+  // Reserved slot used by xray holders to store the xray's expando object.
+  size_t holderExpandoSlot;
+
+  // Reserved slot used by xray expandos to store a custom prototype.
+  size_t expandoProtoSlot;
+};
+
+extern JS_FRIEND_API void SetXrayJitInfo(XrayJitInfo* info);
+
+}  // namespace JS
+
+#endif  // js_friend_XrayJitInfo_h