Implement WebBluetooth descriptor.readValue()

third_party/WebKit/LayoutTests/bluetooth/script-tests/descriptor/io-op-device-disconnects-during-error.js

+'use strict';
+promise_test(() => {
+  let val = new Uint8Array([1]);
+  return setBluetoothFakeAdapter('FailingGATTOperationsAdapter')
+    .then(() => requestDeviceWithKeyDown({
+      filters: [{services: [errorUUID(0xA0)]}],
+      optionalServices: [request_disconnection_service_uuid]
+    }))
+    .then(device => device.gatt.connect())
+    .then(gattServer => {
+      let error_characteristic;
+      return gattServer
+        .getPrimaryService(errorUUID(0xA0))
+        .then(es => es.getCharacteristic(errorUUID(0xA1)))
+        .then(characteristic => characteristic.getDescriptor('gatt.characteristic_user_description'))
+        .then(d => user_description = d)
+        .then(() => get_request_disconnection(gattServer))
+        .then(requestDisconnection => {
+          requestDisconnection();
+          return assert_promise_rejects_with_message(
+            user_description.CALLS([
+              readValue()
+            ]),
+            new DOMException(
+              'GATT Server disconnected while performing a GATT operation.',
+              'NetworkError'));
+        });
+    });
+}, 'Device disconnects during a FUNCTION_NAME call that fails. ' +
+   'Reject with NetworkError.');