You can now easily run your Force apps on a Google App Engine infrastructure by the following code! The rest is the same as a normal dart force app.
ForceServer forceServer = new ForceServer();
runAppEngine(forceServer.requestHandler).then((_) { // Server running. and you can do all the stuff you want! });
You don't need to start ForceServer anymore, start of the server will be done by AppEngine!
More info about GAE overall