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

chrome/browser/chromeos/settings/device_settings_test_helper.cc

 // Copyright (c) 2012 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 "chrome/browser/chromeos/settings/device_settings_test_helper.h"
 
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
 #include "base/threading/sequenced_worker_pool.h"
 #include "chrome/browser/chromeos/ownership/owner_settings_service_chromeos.h"
 #include "chrome/browser/chromeos/ownership/owner_settings_service_chromeos_factory.h"
 #include "chrome/browser/chromeos/policy/proto/chrome_device_policy.pb.h"
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
 #include "chrome/browser/chromeos/settings/device_settings_service.h"
 #include "chrome/test/base/testing_browser_process.h"
 #include "chrome/test/base/testing_profile.h"
+#include "chromeos/cryptohome/cryptohome_parameters.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
 #include "components/ownership/mock_owner_key_util.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/test/test_utils.h"
 
 namespace chromeos {
 
 DeviceSettingsTestHelper::DeviceSettingsTestHelper() {}
 
 DeviceSettingsTestHelper::~DeviceSettingsTestHelper() {}
@@ skipping 77 matching lines @@
   return false;
 }
 
 bool DeviceSettingsTestHelper::IsScreenLocked() const { return false; }
 
 void DeviceSettingsTestHelper::EmitLoginPromptVisible() {}
 
 void DeviceSettingsTestHelper::RestartJob(
     const std::vector<std::string>& argv) {}
 
-void DeviceSettingsTestHelper::StartSession(const std::string& user_email) {}
+void DeviceSettingsTestHelper::StartSession(
+    const cryptohome::Identification& cryptohome_id) {}
 
 void DeviceSettingsTestHelper::StopSession() {}
 
 void DeviceSettingsTestHelper::NotifySupervisedUserCreationStarted() {}
 
 void DeviceSettingsTestHelper::NotifySupervisedUserCreationFinished() {}
 
 void DeviceSettingsTestHelper::StartDeviceWipe() {}
 
 void DeviceSettingsTestHelper::RequestLockScreen() {}
 
 void DeviceSettingsTestHelper::NotifyLockScreenShown() {}
 
 void DeviceSettingsTestHelper::NotifyLockScreenDismissed() {}
 
 void DeviceSettingsTestHelper::RetrieveActiveSessions(
       const ActiveSessionsCallback& callback) {}
 
 void DeviceSettingsTestHelper::RetrieveDevicePolicy(
     const RetrievePolicyCallback& callback) {
   device_policy_.retrieve_callbacks_.push_back(callback);
 }
 
 void DeviceSettingsTestHelper::RetrievePolicyForUser(
-    const std::string& username,
-    const RetrievePolicyCallback& callback) {
-}
+    const cryptohome::Identification& cryptohome_id,
+    const RetrievePolicyCallback& callback) {}
 
 std::string DeviceSettingsTestHelper::BlockingRetrievePolicyForUser(
-    const std::string& username) {
+    const cryptohome::Identification& cryptohome_id) {
   return "";
 }
 
 void DeviceSettingsTestHelper::RetrieveDeviceLocalAccountPolicy(
     const std::string& account_id,
     const RetrievePolicyCallback& callback) {
   device_local_account_policy_[account_id].retrieve_callbacks_.push_back(
       callback);
 }
 
 void DeviceSettingsTestHelper::StoreDevicePolicy(
     const std::string& policy_blob,
     const StorePolicyCallback& callback) {
   device_policy_.policy_blob_ = policy_blob;
   device_policy_.store_callbacks_.push_back(callback);
 }
 
 void DeviceSettingsTestHelper::StorePolicyForUser(
-    const std::string& username,
+    const cryptohome::Identification& cryptohome_id,
     const std::string& policy_blob,
-    const StorePolicyCallback& callback) {
-}
+    const StorePolicyCallback& callback) {}
 
 void DeviceSettingsTestHelper::StoreDeviceLocalAccountPolicy(
     const std::string& account_id,
     const std::string& policy_blob,
     const StorePolicyCallback& callback) {
   device_local_account_policy_[account_id].policy_blob_ = policy_blob;
   device_local_account_policy_[account_id].store_callbacks_.push_back(callback);
 }
 
 void DeviceSettingsTestHelper::SetFlagsForUser(
-    const std::string& account_id,
+    const cryptohome::Identification& cryptohome_id,
     const std::vector<std::string>& flags) {}
 
 void DeviceSettingsTestHelper::GetServerBackedStateKeys(
     const StateKeysCallback& callback) {}
 
 void DeviceSettingsTestHelper::CheckArcAvailability(
     const ArcCallback& callback) {}
 
 void DeviceSettingsTestHelper::StartArcInstance(const std::string& socket_path,
                                                 const ArcCallback& callback) {}
@@ skipping 79 matching lines @@
         const_cast<user_manager::User*>(user));
   }
   OwnerSettingsServiceChromeOS* service =
       OwnerSettingsServiceChromeOSFactory::GetForBrowserContext(profile_.get());
   CHECK(service);
   if (tpm_is_ready)
     service->OnTPMTokenReady(true /* token is enabled */);
 }
 
 }  // namespace chromeos