ChromeOS cryptohome should be able to use gaia id as user identifier.

chromeos/login/auth/utils.h

Index: chromeos/login/auth/utils.h
diff --git a/chromeos/login/auth/utils.h b/chromeos/login/auth/utils.h
new file mode 100644
index 0000000000000000000000000000000000000000..b9a5ff841c5291ae0442c07c352f32d054d4af32
--- /dev/null
+++ b/chromeos/login/auth/utils.h
@@ -0,0 +1,17 @@
+// Copyright 2016 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_AUTH_UTILS_H_
+#define CHROMEOS_LOGIN_AUTH_UTILS_H_
+
+class AccountId;
+
+namespace cryptohome {
+class Identification;
+
+// Lookup AccountId matching givem Identification.

[xiyuan, 2016/02/17 23:14:26]

givem -> the given?

[Alexander Alekseev, 2016/02/18 13:45:15]

Done.

+class AccountId GetAccountId(const Identification& user_id);

[xiyuan, 2016/02/17 23:14:26]

remove "class"?

[Alexander Alekseev, 2016/02/18 13:45:15]

Done.

+}  // namespace cryptohome
+
+#endif  // CHROMEOS_LOGIN_AUTH_UTILS_H_