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

chromeos/dbus/fake_cryptohome_client.h

 // Copyright 2013 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_DBUS_FAKE_CRYPTOHOME_CLIENT_H_
 #define CHROMEOS_DBUS_FAKE_CRYPTOHOME_CLIENT_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 20 matching lines @@
   bool Unmount(bool* success) override;
   void AsyncCheckKey(const std::string& username,
                      const std::string& key,
                      const AsyncMethodCallback& callback) override;
   void AsyncMigrateKey(const std::string& username,
                        const std::string& from_key,
                        const std::string& to_key,
                        const AsyncMethodCallback& callback) override;
   void AsyncRemove(const std::string& username,
                    const AsyncMethodCallback& callback) override;
+  void RenameCryptohome(const cryptohome::AccountIdentifier& id_from,
+                        const cryptohome::AccountIdentifier& id_to,
+                        const ProtobufMethodCallback& callback) override;
   void GetSystemSalt(const GetSystemSaltCallback& callback) override;
   void GetSanitizedUsername(const std::string& username,
                             const StringDBusMethodCallback& callback) override;
   std::string BlockingGetSanitizedUsername(
       const std::string& username) override;
   void AsyncMount(const std::string& username,
                   const std::string& key,
                   int flags,
                   const AsyncMethodCallback& callback) override;
   void AsyncAddKey(const std::string& username,
@@ skipping 12 matching lines @@
   bool CallTpmIsOwnedAndBlock(bool* owned) override;
   void TpmIsBeingOwned(const BoolDBusMethodCallback& callback) override;
   bool CallTpmIsBeingOwnedAndBlock(bool* owning) override;
   void TpmCanAttemptOwnership(const VoidDBusMethodCallback& callback) override;
   void TpmClearStoredPassword(const VoidDBusMethodCallback& callback) override;
   bool CallTpmClearStoredPasswordAndBlock() override;
   void Pkcs11IsTpmTokenReady(const BoolDBusMethodCallback& callback) override;
   void Pkcs11GetTpmTokenInfo(
       const Pkcs11GetTpmTokenInfoCallback& callback) override;
   void Pkcs11GetTpmTokenInfoForUser(
-      const std::string& username,
+      const std::string& user_id,
       const Pkcs11GetTpmTokenInfoCallback& callback) override;
   bool InstallAttributesGet(const std::string& name,
                             std::vector<uint8_t>* value,
                             bool* successful) override;
   bool InstallAttributesSet(const std::string& name,
                             const std::vector<uint8_t>& value,
                             bool* successful) override;
   bool InstallAttributesFinalize(bool* successful) override;
   void InstallAttributesIsReady(
       const BoolDBusMethodCallback& callback) override;
@@ skipping 149 matching lines @@
   std::map<std::string, std::vector<uint8_t>> install_attrs_;
   bool locked_;
   base::WeakPtrFactory<FakeCryptohomeClient> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeCryptohomeClient);
 };
 
 }  // namespace chromeos
 
 #endif  // CHROMEOS_DBUS_FAKE_CRYPTOHOME_CLIENT_H_