Implement WebBluetooth descriptor.readValue()

third_party/WebKit/LayoutTests/bluetooth/script-tests/descriptor/io-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(characteristic => characteristic.getDescriptor('gatt.characteristic_user_description'))
+    .then(error_descriptor => {
+      promise = assert_promise_rejects_with_message(
+        error_descriptor.CALLS([
+          readValue()
+        ]),
+        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_descriptor.characteristic.service.device.gatt.disconnect();
+    })
+    .then(runGarbageCollection)
+    .then(() => promise);
+}, 'Garbage Collection ran during a FUNCTION_NAME call that fails. ' +
+   'Should not crash.');