Implement WebBluetooth getDescriptor[s]

third_party/WebKit/LayoutTests/bluetooth/script-tests/characteristic/gatt-op-garbage-collection-ran-during-error.js

 'use strict';
 promise_test(() => {
   let val = new Uint8Array([1]);
   let promise;
   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(error_characteristic => {
       promise = assert_promise_rejects_with_message(
         error_characteristic.CALLS([
+          getDescriptor(user_description.name)|

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

You already have this test: descriptor-garbage-collection-ran-during-error.js.

gatt-op really means read/write/notify so getDescriptor is a bit out of place.
We should either change the name of the tests to encompass getDescriptor(s) or
move getDescriptor(s) to another test.

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

removed.  Same for gatt-op-garbage-collection-ran-during-success.js.

+          getDescriptors()|
           readValue()|
           writeValue(val)|
           startNotifications()]),
         new DOMException(
           'GATT Server disconnected while performing a GATT operation.',
           'NetworkError'));
       // Disconnect called to clear attributeInstanceMap and allow the
       // object to get garbage collected.
       error_characteristic.service.device.gatt.disconnect();
     })
     .then(runGarbageCollection)
     .then(() => promise);
 }, 'Garbage Collection ran during a FUNCTION_NAME call that fails. ' +
    'Should not crash.');