Accept inbound connections on unix domain socket

mojo/shell/external_application_registrar.mojom

Index: mojo/shell/external_application_registrar.mojom
diff --git a/mojo/shell/external_application_registrar.mojom b/mojo/shell/external_application_registrar.mojom
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+// 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/shell.mojom"
+
+module mojo {
+
+// This interface allows applications running outside the auspices of a Shell
+// to request registration at the given application_url.
+// The shell implementing this interface will make the calling application
+// available to other apps at that URL and bind the provided Shell& to
+// an impl capable of servicing the external application's connection requests.
+interface ExternalApplicationRegistrar {
+  Register(string application_url, Shell& shell) => ();
+};
+
+}