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

mojo/shell/runner/host/BUILD.gn

 # Copyright 2015 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.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//testing/test.gni")
 
 group("host") {
   testonly = true
@@ skipping 58 matching lines @@
   deps = [
     ":child_process_base",
     ":native_application_support",
     "//base",
     "//base:base_static",
     "//base:i18n",
     "//mojo/edk/system",
     "//mojo/message_pump",
     "//mojo/platform_handle:platform_handle_impl",
     "//mojo/shell",
+    "//mojo/shell/public/cpp:sources",
     "//mojo/shell/public/interfaces",
     "//mojo/shell/runner:init",
     "//mojo/shell/runner/common",
   ]
 
   if (is_linux && !is_android) {
     sources += [
       "linux_sandbox.cc",
       "linux_sandbox.h",
     ]
@@ skipping 19 matching lines @@
     "//base",
     "//base/test:test_support",
     "//mojo/edk/system",
     "//mojo/message_pump",
     "//mojo/shell",
     "//mojo/shell/runner:init",
     "//mojo/shell/runner/common",
     "//testing/gtest",
   ]
 }