Added retry policy

chrome/browser/chromeos/BUILD.gn

Index: chrome/browser/chromeos/BUILD.gn
diff --git a/chrome/browser/chromeos/BUILD.gn b/chrome/browser/chromeos/BUILD.gn
index 07c77966a5689d1cdbf190db910529273c7e1f32..559ce3bf179c99ca25cc4150e901b1b89f4a0cd3 100644
--- a/chrome/browser/chromeos/BUILD.gn
+++ b/chrome/browser/chromeos/BUILD.gn
@@ -1450,6 +1450,24 @@ static_library("arc_test_support") {
   ]
 }
 
+static_library("test_support") {
+  testonly = true
+
+  sources = [
+    "login/enrollment/enterprise_enrollment_helper_mock.cc",
+    "login/enrollment/enterprise_enrollment_helper_mock.h",
+    "login/enrollment/mock_enrollment_screen.cc",
+    "login/enrollment/mock_enrollment_screen.h",
+    "login/screens/mock_base_screen_delegate.cc",
+    "login/screens/mock_base_screen_delegate.h",
+  ]
+
+  deps = [
+    "//components/policy/proto",
+    "//testing/gmock",
+  ]
+}
+
 source_set("unit_tests") {
   testonly = true
 
@@ -1576,6 +1594,7 @@ source_set("unit_tests") {
     "login/auth/cryptohome_authenticator_unittest.cc",
     "login/easy_unlock/easy_unlock_challenge_wrapper_unittest.cc",
     "login/easy_unlock/easy_unlock_tpm_key_manager_unittest.cc",
+    "login/enrollment/enrollment_screen_unittest.cc",
     "login/error_screens_histogram_helper_unittest.cc",
     "login/existing_user_controller_auto_login_unittest.cc",
     "login/hwid_checker_unittest.cc",
@@ -1719,6 +1738,7 @@ source_set("unit_tests") {
     ":arc_test_support",
     ":attestation_proto",
     ":device_policy_proto",
+    ":test_support",
     "//ash/resources",
     "//components/drive",
     "//components/drive:test_support_chromeos",