getDevices method
should return a promise (which will be converted to a future using
JSUtils.promiseToFuture
) with a list of Objects. These objects
should then be able to be converted to a WebBluetoothDevice using
WebBluetoothDevice.fromJSObject.
NOTE: Currently no browser supports this without a flag needing to be set!
See:
Implementation
Object getDevices() => _NativeBluetooth.getDevices();