Fix WebBluetooth generator to distinguish between different methods.

third_party/WebKit/LayoutTests/bluetooth/script-tests/characteristic-device-disconnects-invalidates-objects.js

-'use strict';
-promise_test(() => {
-  return setBluetoothFakeAdapter('DisconnectingHealthThermometerAdapter')
-    .then(() => requestDeviceWithKeyDown({
-      filters: [{services: ['health_thermometer']}],
-      optionalServices: [request_disconnection_service_uuid]}))
-    .then(device => device.gatt.connect())
-    .then(gattServer => {
-      let characteristics;
-      return gattServer.getPrimaryService('health_thermometer')
-        .then(service => service.CALLS([
-          getCharacteristic('measurement_interval')|
-          getCharacteristics()|
-          getCharacteristics('measurement_interval')[UUID]]))
-        .then(c => {
-          // Convert to array if necessary.
-          characteristics = [].concat(c);
-          return get_request_disconnection(gattServer);
-        })
-        .then(requestDisconnection => requestDisconnection())
-        .then(() => gattServer.connect())
-        .then(() => characteristics);
-    })
-    .then(characteristics => {
-      let promises = Promise.resolve();
-      for (let characteristic of characteristics) {
-        let error = new DOMException(
-          'Characteristic is no longer valid. Remember to retrieve the ' +
-          'characteristic again after reconnecting.',
-          'InvalidStateError');
-        promises = promises.then(() =>
-          assert_promise_rejects_with_message(
-            characteristic.readValue(),
-            error));
-        promises = promises.then(() =>
-          assert_promise_rejects_with_message(
-            characteristic.writeValue(new Uint8Array([1])),
-            error));
-        promises = promises.then(() =>
-          assert_promise_rejects_with_message(
-            characteristic.startNotifications(),
-            error));
-        promises = promises.then(() =>
-          assert_promise_rejects_with_message(
-            characteristic.stopNotifications(),
-            error));
-      }
-      return promises;
-    });
-}, 'Calls on characteristics after device disconnects and we reconnect. ' +
-   'Should reject with InvalidStateError.');