[Athena] Extract Chrome OS authentication stack

chromeos/login/user_names.h

Index: chromeos/login/user_names.h
diff --git a/chromeos/login/user_names.h b/chromeos/login/user_names.h
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+// Copyright (c) 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.
+
+#ifndef CHROMEOS_LOGIN_USER_NAMES_H_
+#define CHROMEOS_LOGIN_USER_NAMES_H_
+
+#include <string>
+
+#include "chromeos/chromeos_export.h"
+
+namespace chromeos {
+
+namespace login {
+
+// Username for stub login when not running on ChromeOS.
+CHROMEOS_EXPORT extern const char* kStubUser;
+
+// Username for the login screen. It is only used to identify login screen
+// tries to set default wallpaper. It is not a real user.
+CHROMEOS_EXPORT extern const char* kSignInUser;
+
+// Magic e-mail addresses are bad. They exist here because some code already
+// depends on them and it is hard to figure out what. Any user types added in
+// the future should be identified by a new |UserType|, not a new magic e-mail
+// address.
+// Username for Guest session user.
+CHROMEOS_EXPORT extern const char* kGuestUserName;
+
+// Domain that is used for all locally managed users.
+CHROMEOS_EXPORT extern const char* kLocallyManagedUserDomain;
+
+// The retail mode user has a magic, domainless e-mail address.
+CHROMEOS_EXPORT extern const char* kRetailModeUserName;
+
+// Canonicalizes a GAIA user ID, accounting for the legacy guest mode user ID
+// which does trips up gaia::CanonicalizeEmail() because it does not contain an
+// @ symbol.
+CHROMEOS_EXPORT std::string CanonicalizeUserID(const std::string& user_id);
+
+}  // namespace login
+
+}  // namespace chromeos
+
+#endif  // CHROMEOS_LOGIN_USER_NAMES_H_