Implement a policy to autologin a public account.

chrome/chrome_tests.gypi

Index: chrome/chrome_tests.gypi
diff --git a/chrome/chrome_tests.gypi b/chrome/chrome_tests.gypi
index d8cfde4bb28e906431af3794d589e4a3e3797ff4..9996b727b21091631133a965734ef7541ffa0b3d 100644
--- a/chrome/chrome_tests.gypi
+++ b/chrome/chrome_tests.gypi
@@ -1080,12 +1080,17 @@
         'browser/chromeos/login/enrollment/enterprise_enrollment_screen_browsertest.cc',
         'browser/chromeos/login/enrollment/mock_enterprise_enrollment_screen.cc',
         'browser/chromeos/login/enrollment/mock_enterprise_enrollment_screen.h',
+        'browser/chromeos/login/existing_user_controller_auto_login_unittest.cc',
         'browser/chromeos/login/existing_user_controller_browsertest.cc',
         'browser/chromeos/login/login_utils_browsertest.cc',
         'browser/chromeos/login/mock_authenticator.cc',
         'browser/chromeos/login/mock_authenticator.h',
         'browser/chromeos/login/mock_eula_screen.cc',
         'browser/chromeos/login/mock_eula_screen.h',
+        'browser/chromeos/login/mock_login_display.cc',
+        'browser/chromeos/login/mock_login_display.h',
+        'browser/chromeos/login/mock_login_display_host.cc',
+        'browser/chromeos/login/mock_login_display_host.h',
         'browser/chromeos/login/mock_network_screen.cc',
         'browser/chromeos/login/mock_network_screen.h',
         'browser/chromeos/login/mock_screen_observer.cc',
@@ -1305,6 +1310,8 @@
         'browser/policy/device_local_account_browsertest.cc',
         'browser/policy/device_management_service_browsertest.cc',
         'browser/policy/device_status_collector_browsertest.cc',
+        'browser/policy/mock_cloud_policy_store.cc',
+        'browser/policy/mock_cloud_policy_store.h',
         'browser/policy/policy_browsertest.cc',
         'browser/policy/policy_prefs_browsertest.cc',
         'browser/policy/power_policy_browsertest.cc',