Minimal attestation-based enrollment flow.

chrome/browser/ui/webui/chromeos/login/enrollment_screen_handler.cc

Index: chrome/browser/ui/webui/chromeos/login/enrollment_screen_handler.cc
diff --git a/chrome/browser/ui/webui/chromeos/login/enrollment_screen_handler.cc b/chrome/browser/ui/webui/chromeos/login/enrollment_screen_handler.cc
index 6f8bf8ae28d84df3e1aa67cc2e2f60f74ec9940c..0885d44a886d5f1c472240ef9efefbb35ec13c30 100644
--- a/chrome/browser/ui/webui/chromeos/login/enrollment_screen_handler.cc
+++ b/chrome/browser/ui/webui/chromeos/login/enrollment_screen_handler.cc
@@ -56,9 +56,11 @@ std::string EnrollmentModeToUIMode(policy::EnrollmentConfig::Mode mode) {
     case policy::EnrollmentConfig::MODE_MANUAL_REENROLLMENT:
     case policy::EnrollmentConfig::MODE_LOCAL_ADVERTISED:
     case policy::EnrollmentConfig::MODE_SERVER_ADVERTISED:
+    case policy::EnrollmentConfig::MODE_ATTESTATION:
       return kEnrollmentModeUIManual;
     case policy::EnrollmentConfig::MODE_LOCAL_FORCED:
     case policy::EnrollmentConfig::MODE_SERVER_FORCED:
+    case policy::EnrollmentConfig::MODE_ATTESTATION_FORCED:
       return kEnrollmentModeUIForced;
     case policy::EnrollmentConfig::MODE_RECOVERY:
       return kEnrollmentModeUIRecovery;
@@ -143,7 +145,7 @@ void EnrollmentScreenHandler::RegisterMessages() {
 void EnrollmentScreenHandler::SetParameters(
     Controller* controller,
     const policy::EnrollmentConfig& config) {
-  CHECK_NE(policy::EnrollmentConfig::MODE_NONE, config.mode);
+  CHECK(config.should_enroll());
   controller_ = controller;
   config_ = config;
 }
@@ -264,7 +266,7 @@ void EnrollmentScreenHandler::ShowEnrollmentStatus(
       return;
     case policy::EnrollmentStatus::STATUS_REGISTRATION_CERTIFICATE_FETCH_FAILED:
       ShowError(IDS_ENTERPRISE_ENROLLMENT_STATUS_REGISTRATION_CERT_FETCH_FAILED,
-                false);
+                true);
       return;
     case policy::EnrollmentStatus::STATUS_POLICY_FETCH_FAILED:
       ShowErrorMessage(