script: Move code generation and webidl files to new script_bindings crate. (#35157)

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

components/script_bindings/webidls/XRLayerEvent.webidl

@@ -0,0 +1,16 @@
+/* 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 https://mozilla.org/MPL/2.0/. */
+
+// skip-unless CARGO_FEATURE_WEBXR
+
+// https://immersive-web.github.io/layers/#xrlayerevent-interface
+[SecureContext, Exposed=Window, Pref="dom_webxr_layers_enabled"]
+interface XRLayerEvent : Event {
+  constructor(DOMString type, XRLayerEventInit eventInitDict);
+  [SameObject] readonly attribute XRLayer layer;
+};
+
+dictionary XRLayerEventInit : EventInit {
+  required XRLayer layer;
+};