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

chrome/browser/chromeos/login/wizard_controller.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/login/wizard_controller.h"
 
 #include <signal.h>
 #include <stddef.h>
 #include <stdlib.h>
 #include <sys/types.h>
@@ skipping 138 matching lines @@
       chromeos::switches::kOobeBootstrappingSlave);
 }
 
 // Checks if the device is a "Master" device in the bootstrapping process.
 bool IsBootstrappingMaster() {
   return base::CommandLine::ForCurrentProcess()->HasSwitch(
       chromeos::switches::kOobeBootstrappingMaster);
 }
 
 bool NetworkAllowUpdate(const chromeos::NetworkState* network) {
+  return false;  // Force disable update.

[xiyuan, 2016/02/17 23:14:25]

debugging code?

[Alexander Alekseev, 2016/02/18 13:45:14]

Yes. this was for debugging only. Removed.

   if (!network || !network->IsConnectedState())
     return false;
   if (network->type() == shill::kTypeBluetooth ||
       (network->type() == shill::kTypeCellular &&
        !help_utils_chromeos::IsUpdateOverCellularAllowed())) {
     return false;
   }
   return true;
 }
 
@@ skipping 1208 matching lines @@
             : policy::EnrollmentConfig::MODE_MANUAL_REENROLLMENT;
   }
 
   EnrollmentScreen* screen = EnrollmentScreen::Get(this);
   screen->SetParameters(effective_config, shark_controller_.get());
   SetStatusAreaVisible(true);
   SetCurrentScreen(screen);
 }
 
 }  // namespace chromeos