Add Initialize() method to Application with ability to send args using

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.
 
 import "mojo/public/interfaces/application/service_provider.mojom"
 
 module mojo {
 
 // Applications vend Services through the ServiceProvider interface. Services
 // implement Interfaces.
 [Client=Shell]
 interface Application {
+  // Initialize is guaranteed to be called before any AcceptConnection calls.
+  Initialize(string[]? args);
+
   AcceptConnection(string? requestor_url, ServiceProvider? provider);
 };
 
 }