Added ConnectionTimeObserver to calculate the times to authenticate and connect.

remoting/test/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.
 
 source_set("test_support") {
   testonly = true
 
   sources = [
     "access_token_fetcher.cc",
     "access_token_fetcher.h",
     "app_remoting_report_issue_request.cc",
     "app_remoting_report_issue_request.h",
     "app_remoting_service_urls.cc",
     "app_remoting_service_urls.h",
     "connection_setup_info.cc",
     "connection_setup_info.h",
+    "connection_time_observer.cc",
+    "connection_time_observer.h",
     "fake_access_token_fetcher.cc",
     "fake_access_token_fetcher.h",
     "fake_app_remoting_report_issue_request.cc",
     "fake_app_remoting_report_issue_request.h",
     "fake_network_dispatcher.cc",
     "fake_network_dispatcher.h",
     "fake_network_manager.cc",
     "fake_network_manager.h",
     "fake_port_allocator.cc",
     "fake_port_allocator.h",
@@ skipping 91 matching lines @@
     "//testing/gtest",
   ]
 }
 
 source_set("unit_tests") {
   testonly = true
 
   sources = [
     "access_token_fetcher_unittest.cc",
     "app_remoting_report_issue_request_unittest.cc",
+    "connection_time_observer_unittest.cc",
     "host_list_fetcher_unittest.cc",
     "remote_host_info_fetcher_unittest.cc",
     "test_chromoting_client_unittest.cc",
     "test_video_renderer_unittest.cc",
 
     # TODO(sergeyu): app_remoting_test_driver_environment_unittest.cc
     # depends on ar_test_driver_common target and that target implicitly
     # depends on app_remoting_test_driver_environment_app_details.cc to
     # allow some parameters to be overridden (i.e. *app_details.cc file can
     # be replace with a different one). This means that app_deails.cc file
     # has to be included here explicitly. Fix
     # app_remoting_test_driver_environment.cc to avoid this implicit
     # dependency on *app_details.cc .
     # http://crbug.com/510887
     "app_remoting_test_driver_environment_app_details.cc",
     "app_remoting_test_driver_environment_unittest.cc",
   ]
 
   deps = [
     ":test_support",
     ":ar_test_driver_common",
     "//base",
     "//net:test_support",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/libyuv",
     "//third_party/webrtc/modules/desktop_capture",
   ]
 }