Add an ApplicationConnector interface, etc.

mojo/public/interfaces/application/shell.mojom

Index: mojo/public/interfaces/application/shell.mojom
diff --git a/mojo/public/interfaces/application/shell.mojom b/mojo/public/interfaces/application/shell.mojom
index b2d8491de456b30d089106cfd901935e015778d6..dc210c74461f6781eacf1e2375ca7721aa68fe6b 100644
--- a/mojo/public/interfaces/application/shell.mojom
+++ b/mojo/public/interfaces/application/shell.mojom
@@ -5,35 +5,18 @@
 [DartPackage="mojo"]
 module mojo;
 
+import "mojo/public/interfaces/application/application_connector.mojom";
 import "mojo/public/interfaces/application/service_provider.mojom";
 
 // An interface through which a Mojo application may communicate with the Mojo
 // system and request connections to other applications.
 interface Shell {
-  // Establishes a connection with another application (located at
-  // |application_url|) through which the calling application and the other
-  // application may request services from one another.
-  //
-  // If the calling application would like to request services from the other
-  // application, it should pass a valid interface request in the |services|
-  // parameter (i.e. one containing a valid message pipe endpoint). If the other
-  // application does not wish to offer services, it may either not bind an
-  // implementation to the interface request, or else bind an implementation
-  // that will reject some or all service requests.
-  //
-  // If the calling application would like to offer services to the other
-  // application, it should pass a bound interface through the
-  // |exposed_services| parameter. The other application may then request
-  // services through that interface.
-  //
-  // At least one of |services| or |exposed_services| should be valid/bound in
-  // the call.
-  //
-  // If the |application_url| does not contain a domain, but is of the form
-  // "mojo:{service}", it is up to the Mojo shell to select an appropriate
-  // application for the service. Currently, the shell does this based on the
-  // value of its --origin flag.
+  // See |ApplicationConnector.ConnectToApplication()|.
+  // TODO(vtl): Maybe this should be deprecated/removed.
   ConnectToApplication(string application_url,
                        ServiceProvider&? services,
                        ServiceProvider? exposed_services);
+
+  CreateApplicationConnector(
+      ApplicationConnector& application_connector_request);
 };