Implement WebBluetooth getDescriptor[s]

third_party/WebKit/LayoutTests/bluetooth/script-tests/characteristic/gatt-op-device-disconnects-during-success.js

 'use strict';
 promise_test(() => {
   let val = new Uint8Array([1]);
   return setBluetoothFakeAdapter('DisconnectingHealthThermometerAdapter')
     .then(() => requestDeviceWithKeyDown({
       filters: [{services: ['health_thermometer']}],
       optionalServices: [request_disconnection_service_uuid]
     }))
     .then(device => device.gatt.connect())
     .then(gattServer => {
       let measurement_interval;
       return gattServer
         .getPrimaryService('health_thermometer')
         .then(ht=> ht.getCharacteristic('measurement_interval'))
         .then(mi => measurement_interval = mi)
         .then(() => get_request_disconnection(gattServer))
         .then(requestDisconnection => {
           requestDisconnection();
           return assert_promise_rejects_with_message(
             measurement_interval.CALLS([
+              getDescriptor(user_description.name)|

[ortuno, 2016/12/07 08:05:13]

[uuid] variant

[dougt, 2016/12/07 19:48:58]

Done.

+              getDescriptors()|
               readValue()|
               writeValue(val)|
               startNotifications()|
               stopNotifications()]),
             new DOMException(
               'GATT Server disconnected while performing a GATT operation.',
               'NetworkError'));
         });
     });
 }, 'Device disconnects during a FUNCTION_NAME call that succeeds. ' +
    'Reject with NetworkError.');