Add Application::RequestQuit()

mojo/public/interfaces/application/application.mojom

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 module mojo;
 
 import "mojo/public/interfaces/application/service_provider.mojom";
 
 // Applications vend Services through the ServiceProvider interface. Services
 // implement Interfaces.
 interface Application {
   // Initialize is guaranteed to be called before any AcceptConnection calls.
   Initialize(array<string>? args);
 
   // Called in response to a call to mojo.Shell.ConnectToApplication().
   // The |services| and |exposed_services| parameters are the same as those on
   // mojo.Shell.ConnectToApplication().
   // |services| will be used to look up services provided by this application.
   // |exposed_services| can be used to look up services exposed by the
   // application at |requestor_url|.
   AcceptConnection(string requestor_url,
                    ServiceProvider&? services,
                    ServiceProvider? exposed_services);
+
+  // Called to request the application shut itself down gracefully.
+  RequestQuit();
 };