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

chromeos/dbus/fake_cryptohome_client.cc

 // 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.
 
 #include "chromeos/dbus/fake_cryptohome_client.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include "base/bind.h"
@@ skipping 75 matching lines @@
     const AsyncMethodCallback& callback) {
   ReturnAsyncMethodResult(callback, false);
 }
 
 void FakeCryptohomeClient::AsyncRemove(
     const std::string& username,
     const AsyncMethodCallback& callback) {
   ReturnAsyncMethodResult(callback, false);
 }
 
+void FakeCryptohomeClient::RenameCryptohome(
+    const cryptohome::AccountIdentifier& id_from,
+    const cryptohome::AccountIdentifier& id_to,
+    const ProtobufMethodCallback& callback) {
+  cryptohome::BaseReply reply;
+  ReturnProtobufMethodCallback(reply, callback);
+}
+
 void FakeCryptohomeClient::GetSystemSalt(
     const GetSystemSaltCallback& callback) {
   base::MessageLoop::current()->PostTask(
       FROM_HERE,
       base::Bind(callback, DBUS_METHOD_CALL_SUCCESS, system_salt_));
 }
 
 void FakeCryptohomeClient::GetSanitizedUsername(
     const std::string& username,
     const StringDBusMethodCallback& callback) {
@@ skipping 376 matching lines @@
 }
 
 void FakeCryptohomeClient::MountEx(
     const cryptohome::AccountIdentifier& id,
     const cryptohome::AuthorizationRequest& auth,
     const cryptohome::MountRequest& request,
     const ProtobufMethodCallback& callback) {
   cryptohome::BaseReply reply;
   cryptohome::MountReply* mount =
       reply.MutableExtension(cryptohome::MountReply::reply);
-  mount->set_sanitized_username(GetStubSanitizedUsername(id.email()));
+  mount->set_sanitized_username(GetStubSanitizedUsername(id.account_id()));
   ReturnProtobufMethodCallback(reply, callback);
 }
 
 void FakeCryptohomeClient::AddKeyEx(
     const cryptohome::AccountIdentifier& id,
     const cryptohome::AuthorizationRequest& auth,
     const cryptohome::AddKeyRequest& request,
     const ProtobufMethodCallback& callback) {
   cryptohome::BaseReply reply;
   ReturnProtobufMethodCallback(reply, callback);
@@ skipping 96 matching lines @@
         FROM_HERE,
         base::Bind(async_call_status_data_handler_,
                    async_call_id_,
                    true,
                    std::string()));
   }
   ++async_call_id_;
 }
 
 }  // namespace chromeos