bluetooth: Implement Service.getCharacteristics

third_party/WebKit/LayoutTests/bluetooth/getCharacteristic.html

 <!DOCTYPE html>
 <script src="../resources/testharness.js"></script>
 <script src="../resources/testharnessreport.js"></script>
 <script src="resources/bluetooth-helpers.js"></script>
 <script>
 'use strict';
 
 test(t => { assert_true(window.testRunner instanceof Object); t.done(); },
      'window.testRunner is required for the following tests.');
 
@@ skipping 22 matching lines @@
     .then(service => {
       testRunner.setBluetoothMockDataSet('MissingServiceHeartRateAdapter');
       return assert_promise_rejects_with_message(
         service.getCharacteristic('gap.device_name'),
         new DOMException('GATT Service no longer exists.',
                          'InvalidStateError'),
         'Service got removed.');
     });
 }, 'Service is removed. Reject with InvalidStateError.');
 
-
 promise_test(() => {
   testRunner.setBluetoothMockDataSet('HeartRateAdapter');
-  let expected = new DOMException('Characteristic not found in device.',
+  let expected = new DOMException('No Characteristics with specified UUID found in Service.',
                                   'NotFoundError');
   return requestDeviceWithKeyDown({filters: [{services: ['heart_rate']}],
                                    optionalServices: ['generic_access']})
     .then(device => device.gatt.connect())
     .then(gattServer => gattServer.getPrimaryService('generic_access'))
     .then(service => Promise.all(
       [assert_promise_rejects_with_message(
         service.getCharacteristic(battery_level.alias), expected),
        assert_promise_rejects_with_message(
          service.getCharacteristic(battery_level.name), expected),
@@ skipping 62 matching lines @@
           '\'00001234-0000-1000-8000-00805f9b34fb\'), ' +
           'or recognized standard name from ' +
           'https://developer.bluetooth.org/gatt/characteristics/' +
           'Pages/CharacteristicsHome.aspx' +
           ' e.g. \'aerobic_heart_rate_lower_limit\'.',
           'SyntaxError'),
         'Wrong Characteristic name passed.');
     });
 }, 'Wrong Characteristic name. Reject with SyntaxError.');
 </script>