Integrate WebUSB with Feature Policy

third_party/WebKit/LayoutTests/external/wpt/webusb/resources/featurepolicytest.js

Index: third_party/WebKit/LayoutTests/external/wpt/webusb/resources/featurepolicytest.js
diff --git a/third_party/WebKit/LayoutTests/external/wpt/webusb/resources/featurepolicytest.js b/third_party/WebKit/LayoutTests/external/wpt/webusb/resources/featurepolicytest.js
new file mode 100644
index 0000000000000000000000000000000000000000..243242eefbbd0cb759eb7030e9668336ea20aa5a
--- /dev/null
+++ b/third_party/WebKit/LayoutTests/external/wpt/webusb/resources/featurepolicytest.js
@@ -0,0 +1,14 @@
+function assert_usb_available_in_iframe(test, origin, expected) {
+  let frame = document.createElement('iframe');
+  frame.src = origin + '/webusb/resources/check-availability.html';
+
+  window.addEventListener('message', test.step_func(evt => {
+    if (evt.source == frame.contentWindow) {
+      assert_equals(evt.data, expected);
+      document.body.removeChild(frame);
+      test.done();
+    }
+  }));
+
+  document.body.appendChild(frame);
+}