Pass application ids via AcceptConnection & ConnectToApplication callback.

mojo/shell/public/interfaces/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/shell/public/interfaces/service_provider.mojom";
 import "mojo/shell/public/interfaces/shell.mojom";
 
 // This is the primary interface implemented by every Mojo application. It
 // allows the application to receive its startup arguments from the shell, and
 // to be notified of events that occur during its execution.
 //
 // TODO(aa): It would be good to reorder the parameters once we have interface
 // versioning.
 interface Application {
   // Initializes the application with the specified arguments. This method is
   // guaranteed to be called before any other method is called, and will only be
   // called once.
   //
   // The |url| parameter is the identity of the application as far as the shell
   // is concerned. This will be the URL the application was found at, after all
   // mappings, resolution, and redirects. And it will not include the
   // querystring, since the querystring is not part of an application's
   // identity.
-  Initialize(Shell shell, string url);
+  Initialize(Shell shell, string url, uint32 id);

[sky, 2016/01/12 20:57:44]

nit: document what |id| is.

 
   // Called when another application (identified by |requestor_url|) attempts to
   // open a connection to this application.
   //
   // If the other application wants to request services from this application,
   // it will have passed a valid interface request through the |services|
   // parameter (i.e. one containing a valid message pipe endpoint). This
   // application may then bind an implementation of |ServiceProvider| to that
   // request in order to make services available to the other application.
   //
@@ skipping 14 matching lines @@
   // application. When this parameter is empty, this application should expose
   // no services to the connecting application. When this parameter contains
   // only the single string value "*" the application may expose all of its
   // services to the connecting application.
   //
   // |resolved_url| is the URL that was requested to create this connection,
   // after all mappings, resolutions, and redirects. This will include any
   // querystring that was part of the request.
   //
   AcceptConnection(string requestor_url,
+                   uint32 requestor_id,
                    ServiceProvider&? services,
                    ServiceProvider? exposed_services,
                    array<string> allowed_interfaces,
                    string resolved_url);
 
   // Called by the shell in response to calling Shell's QuitApplication. The
   // application should run the callback with true if shutdown can proceed.
   // See Shell::QuitApplication for details about shutdown workflow.
   OnQuitRequested() => (bool can_quit);
 };