Add interfaces/content-index.idl and test (#24211)

Closes #24203

content-index/idlharness.https.any.js

@@ -0,0 +1,33 @@
+// META: global=window,worker
+// META: script=/resources/WebIDLParser.js
+// META: script=/resources/idlharness.js
+// META: script=/service-workers/service-worker/resources/test-helpers.sub.js
+
+'use strict';
+
+// https://wicg.github.io/content-index/spec/
+
+idl_test(
+  ['content-index'],
+  ['service-workers', 'html', 'dom'],
+  async (idl_array, t) => {
+    // TODO: Handle other worker types.
+    if (self.GLOBAL.isWindow()) {
+      idl_array.add_objects({
+        ServiceWorkerRegistration: ['registration'],
+        ContentIndex: ['registration.index'],
+      });
+      self.registration = await service_worker_unregister_and_register(
+          t, 'resources/sw.js', 'resources/does/not/exist');
+      t.add_cleanup(() => registration.unregister());
+    }
+    else if (self.ServiceWorkerGlobalScope) {
+      idl_array.add_objects({
+        ServiceWorkerGlobalScope: ['self'],
+        ServiceWorkerRegistration: ['registration'],
+        ContentIndex: ['registration.index'],
+        ContentIndexEvent: ['new ContentIndexEvent("type", {id: "foo"})'],
+      });
+    }
+  }
+);

interfaces/content-index.idl

@@ -0,0 +1,45 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into reffy-reports
+// (https://github.com/tidoust/reffy-reports)
+// Source: Content Index (https://wicg.github.io/content-index/spec/)
+
+partial interface ServiceWorkerGlobalScope {
+  attribute EventHandler oncontentdelete;
+};
+
+partial interface ServiceWorkerRegistration {
+  [SameObject] readonly attribute ContentIndex index;
+};
+
+enum ContentCategory {
+  "",
+  "homepage",
+  "article",
+  "video",
+  "audio",
+};
+
+dictionary ContentDescription {
+  required DOMString id;
+  required DOMString title;
+  required DOMString description;
+  ContentCategory category = "";
+  sequence<ImageResource> icons = [];
+  required USVString url;
+};
+
+[Exposed=(Window,Worker)]
+interface ContentIndex {
+  Promise<void> add(ContentDescription description);
+  Promise<void> delete(DOMString id);
+  Promise<sequence<ContentDescription>> getAll();
+};
+
+dictionary ContentIndexEventInit : ExtendableEventInit {
+  required DOMString id;
+};
+
+[Constructor(DOMString type, ContentIndexEventInit init), Exposed=ServiceWorker]
+interface ContentIndexEvent : ExtendableEvent {
+  readonly attribute DOMString id;
+};