Add interfaces/dom-overlays.idl and test (web-platform-tests#24634)

Closes web-platform-tests#24192

interfaces/dom-overlays.idl

@@ -0,0 +1,31 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into reffy-reports
+// (https://github.com/tidoust/reffy-reports)
+// Source: WebXR DOM Overlays Module (https://immersive-web.github.io/dom-overlays/)
+
+partial interface mixin GlobalEventHandlers {
+  attribute EventHandler onbeforexrselect;
+};
+
+partial dictionary XRSessionInit {
+  XRDOMOverlayInit? domOverlay;
+};
+
+partial interface XRSession {
+  readonly attribute XRDOMOverlayState? domOverlayState;
+};
+
+dictionary XRDOMOverlayInit {
+  required Element root;
+};
+
+enum XRDOMOverlayType {
+  "screen",
+  "floating",
+  "head-locked"
+};
+
+dictionary XRDOMOverlayState {
+  XRDOMOverlayType type;
+
+};

webxr/dom-overlay/idlharness.https.window.js

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+// META: script=/resources/WebIDLParser.js
+// META: script=/resources/idlharness.js
+
+'use strict';
+
+// https://immersive-web.github.io/dom-overlays/
+
+idl_test(
+  ['dom-overlays'],
+  ['webxr', 'html', 'dom'],
+  async idl_array => {
+    idl_array.add_objects({
+      // TODO: Add object instances
+    });
+  }
+);