Add a instance groups to Connect(), and introduce an Identity struct.

mojo/shell/BUILD.gn

 # 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/mojo_application_manifest.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//testing/test.gni")
 
 group("all") {
   testonly = true
   deps = [
     ":shell",
     "//mojo/shell/background",
     "//mojo/shell/runner",
     "//mojo/shell/standalone",
     "//mojo/shell/tests",
   ]
 }
 
 source_set("shell") {
   output_name = "mojo_shell"
   sources = [
     "connect_params.cc",
     "connect_params.h",
     "connect_util.cc",
     "connect_util.h",
-    "identity.cc",
-    "identity.h",
     "loader.h",
     "native_runner.h",
     "native_runner_delegate.h",
     "shell.cc",
     "shell.h",
     "switches.cc",
     "switches.h",
   ]
 
   deps = [
@@ skipping 15 matching lines @@
   ]
 
   # For mojo/shell/application_loader.h
   allow_circular_includes_from = [ "//mojo/services/package_manager:lib" ]
 }
 
 mojo_application_manifest("manifest") {
   application_name = "shell"
   source = "manifest.json"
 }