bluetooth: show better error messages for services, characteristics and descriptors

third_party/WebKit/LayoutTests/bluetooth/script-tests/service/device-disconnects-invalidates-objects.js

 'use strict';
 promise_test(() => {
   return setBluetoothFakeAdapter('DisconnectingHealthThermometerAdapter')
     .then(() => requestDeviceWithKeyDown({
       filters: [{services: ['health_thermometer']}],
       optionalServices: [request_disconnection_service_uuid]}))
     .then(device => device.gatt.connect())
     .then(gattServer => {
       let characteristics;
       return gattServer.getPrimaryService('health_thermometer')
         .then(service => service.CALLS([
           getCharacteristic('measurement_interval')|
           getCharacteristics()|
           getCharacteristics('measurement_interval')[UUID]]))
         .then(c => {
           // Convert to array if necessary.
           characteristics = [].concat(c);
           return get_request_disconnection(gattServer);
         })
         .then(requestDisconnection => requestDisconnection())
         .then(() => gattServer.connect())
         .then(() => characteristics);
     })
     .then(characteristics => {
       let promises = Promise.resolve();
       for (let characteristic of characteristics) {
         let error = new DOMException(
-          'Characteristic is no longer valid. Remember to retrieve the ' +
+          'Characteristic with UUID ' + characteristic.uuid +
+          ' is no longer valid. Remember to retrieve the ' +
           'characteristic again after reconnecting.',
           'InvalidStateError');
         promises = promises.then(() =>
           assert_promise_rejects_with_message(
             characteristic.readValue(),
             error));
         promises = promises.then(() =>
           assert_promise_rejects_with_message(
             characteristic.writeValue(new Uint8Array([1])),
             error));
         promises = promises.then(() =>
           assert_promise_rejects_with_message(
             characteristic.startNotifications(),
             error));
         promises = promises.then(() =>
           assert_promise_rejects_with_message(
             characteristic.stopNotifications(),
             error));
       }
       return promises;
     });
 }, 'Calls on characteristics after device disconnects and we reconnect. ' +
    'Should reject with InvalidStateError.');