private SemanticsServer.Proxy createSemanticsServer() {
   Core core = CoreImpl.getInstance();
   Pair<SemanticsServer.Proxy, InterfaceRequest<SemanticsServer>> server =
       SemanticsServer.MANAGER.getInterfaceRequest(core);
   mDartServiceProvider.connectToService(
       SemanticsServer.MANAGER.getName(), server.second.passHandle());
   return server.first;
 }
 private void postRun() {
   Core core = CoreImpl.getInstance();
   // Connect to the ApplicationMessages service exported by the Flutter framework
   Pair<ApplicationMessages.Proxy, InterfaceRequest<ApplicationMessages>> appMessages =
       ApplicationMessages.MANAGER.getInterfaceRequest(core);
   mDartServiceProvider.connectToService(
       ApplicationMessages.MANAGER.getName(), appMessages.second.passHandle());
   mFlutterAppMessages = appMessages.first;
 }