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

chrome/browser/ui/startup/startup_browser_creator.cc

Index: chrome/browser/ui/startup/startup_browser_creator.cc
diff --git a/chrome/browser/ui/startup/startup_browser_creator.cc b/chrome/browser/ui/startup/startup_browser_creator.cc
index d8b21e373beda1d3ab05db5f3a7c39fc3028cbe1..5a7d914c7a323bfa0ea31ff3a716e3af9deb6cf7 100644
--- a/chrome/browser/ui/startup/startup_browser_creator.cc
+++ b/chrome/browser/ui/startup/startup_browser_creator.cc
@@ -85,6 +85,8 @@
 #include "chrome/browser/chromeos/profiles/profile_helper.h"
 #include "chrome/browser/lifetime/application_lifetime.h"
 #include "chromeos/chromeos_switches.h"
+#include "chromeos/cryptohome/cryptohome_parameters.h"
+#include "chromeos/login/auth/utils.h"
 #include "components/user_manager/user_manager.h"
 #endif
 
@@ -673,7 +675,9 @@ bool StartupBrowserCreator::ProcessCmdLineImpl(
   // possible. We should instead cleanly exit and go back to the OOBE screen,
   // where we will launch again after the timeout has expired.
   if (chromeos::DemoAppLauncher::IsDemoAppSession(
-      command_line.GetSwitchValueASCII(chromeos::switches::kLoginUser))) {
+          cryptohome::GetAccountId(cryptohome::Identification::FromString(
+              command_line.GetSwitchValueASCII(
+                  chromeos::switches::kLoginUser))))) {
     chrome::AttemptUserExit();
     return false;
   }