Initial skeletal implementation of the PrincipalService. Also, use the Login()/GetUserBlessing()

examples/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("//build/config/ui.gni")
 
 group("examples") {
   testonly = true
 
   deps = [
     "//examples/apptest",
+    "//examples/bank_app",
     "//examples/browser",
     "//examples/content_handler_demo",
     "//examples/dart/device_info",
     "//examples/dart/hello_world/hello",
     "//examples/dart/hello_world/world",
     "//examples/dart/netcat",
     "//examples/dart/wget",
     "//examples/echo",
     "//examples/echo_terminal",
     "//examples/embedded_app",
@@ skipping 28 matching lines @@
   }
 
   if (defined(go_build_tool) && go_build_tool != "") {
     deps += [ "//examples/go" ]
   }
 
   if (is_linux) {
     deps += [ "//examples/python" ]
   }
 }