Implement WebBluetooth descriptor.writeValue()

third_party/WebKit/LayoutTests/bluetooth/script-tests/descriptor/descriptor-is-removed.js

 'use strict';
 promise_test(() => {
+  let val = new Uint8Array([1]);
   return setBluetoothFakeAdapter('DisconnectingHealthThermometerAdapter')
       .then(
           () => requestDeviceWithKeyDown(
               {filters: [{services: ['health_thermometer']}]}))
       .then(device => device.gatt.connect())
       .then(gattServer => gattServer.getPrimaryService('health_thermometer'))
       .then(service => service.getCharacteristic('measurement_interval'))
       .then(
           characteristic => characteristic.getDescriptor(user_description.name))
       .then(descriptor => {
         return setBluetoothFakeAdapter(
                    'MissingDescriptorsDisconnectingHealthThermometerAdapter')
             .then(
                 () => assert_promise_rejects_with_message(
-                    descriptor.CALLS([readValue()]),
+                    descriptor.CALLS([readValue()|writeValue(val)]),
                     new DOMException(
                         'GATT Descriptor no longer exists.',
                         'InvalidStateError'),
                     'Descriptor got removed.'));
       });
 }, 'Descriptor gets removed. Reject with InvalidStateError.');