Implement WebBluetooth descriptor.writeValue()

third_party/WebKit/LayoutTests/bluetooth/script-tests/descriptor/io-op-fails.js

 'use strict';
 promise_test(
     () => {
+        let val = new Uint8Array([1]);
         return setBluetoothFakeAdapter('FailingGATTOperationsAdapter')
             .then(
                 () => requestDeviceWithKeyDown(
                     {filters: [{services: [errorUUID(0xA0)]}]}))
             .then(device => device.gatt.connect())
             .then(gattServer => gattServer.getPrimaryService(errorUUID(0xA0)))
             .then(
                 service => {
                     service.getCharacteristic(errorUUID(0xA1))
                         .then(characteristic => {
                           let tests = Promise.resolve();
                           gatt_errors_tests.forEach(testSpec => {
                             tests =
                                 tests
                                     .then(
                                         () => characteristic.getDescriptor(
                                             testSpec.uuid))
                                     .then(
                                         descriptor =>
                                             assert_promise_rejects_with_message(
-                                                descriptor.CALLS([readValue()]),
+                                                descriptor.CALLS([readValue()|writeValue(val)]),
                                                 testSpec.error,
                                                 testSpec.testName));
                           });
                           return tests;
                         })})},
     'FUNCTION_NAME fails. Should reject with appropriate error.');