Implement WebBluetooth descriptor.readValue()

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

+'use strict';
+promise_test(() => {
+  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('gatt.characteristic_user_description'))
+    .then(descriptor => {
+      return setBluetoothFakeAdapter('MissingDescriptorsDisconnectingHealthThermometerAdapter')
+        .then(() => assert_promise_rejects_with_message(
+          descriptor.CALLS([
+              readValue()
+          ]),
+          new DOMException(
+            'GATT Descriptor no longer exists.',
+            'InvalidStateError'),
+          'Descriptor got removed.'));
+    });
+}, 'Descriptor gets removed. Reject with InvalidStateError.');
+