Add interfaces/ua-client-hints.idl and test (#24223)

Closes #24218

interfaces/ua-client-hints.idl

@@ -0,0 +1,32 @@
+// GENERATED CONTENT - DO NOT EDIT
+// Content was automatically extracted by Reffy into reffy-reports
+// (https://github.com/tidoust/reffy-reports)
+// Source: User-Agent Client Hints (https://wicg.github.io/ua-client-hints/)
+
+dictionary NavigatorUABrandVersion {
+  DOMString brand;
+  DOMString version;
+};
+
+dictionary UADataValues {
+  DOMString platform;
+
+  DOMString platformVersion;
+  DOMString architecture;
+  DOMString model;
+  DOMString uaFullVersion;
+};
+
+[Exposed=(Window,Worker)]
+interface NavigatorUAData {
+  readonly attribute FrozenArray<NavigatorUABrandVersion> brands;
+  readonly attribute boolean mobile;
+  Promise<UADataValues> getHighEntropyValues(sequence<DOMString> hints);
+};
+
+interface mixin NavigatorUA {
+  [SecureContext] readonly attribute NavigatorUAData userAgentData;
+};
+
+Navigator includes NavigatorUA;
+WorkerNavigator includes NavigatorUA;

ua-client-hints/idlharness.https.any.js

@@ -0,0 +1,21 @@
+// META: script=/resources/WebIDLParser.js
+// META: script=/resources/idlharness.js
+
+'use strict';
+
+// https://wicg.github.io/ua-client-hints/
+
+idl_test(
+  ['ua-client-hints'],
+  ['html', 'dom'],
+  idl_array => {
+    if (self.GLOBAL.isWorker()) {
+      idl_array.add_objects({ WorkerNavigator: ['navigator'] });
+    } else {
+      idl_array.add_objects({ Navigator: ['navigator'] });
+    }
+    idl_array.add_objects({
+      NavigatorUAData: ['navigator.userAgentData'],
+    });
+  }
+);