[cros] Display emails of users are stored in a separate dictionary in Local State.

chrome/browser/chromeos/login/existing_user_controller.cc

Index: chrome/browser/chromeos/login/existing_user_controller.cc
diff --git a/chrome/browser/chromeos/login/existing_user_controller.cc b/chrome/browser/chromeos/login/existing_user_controller.cc
index 1efdcdb8f1a9e94abab9428d0b65e12edb4176a9..5335fc6010fcef39d379fff273d7b412e3dfa279 100644
--- a/chrome/browser/chromeos/login/existing_user_controller.cc
+++ b/chrome/browser/chromeos/login/existing_user_controller.cc
@@ -173,6 +173,10 @@ void ExistingUserController::FixCaptivePortal() {
   LoginAsGuest();
 }
 
+void ExistingUserController::SetDisplayEmail(const std::string& email) {
+  next_login_display_email_ = email;
+}
+
 void ExistingUserController::CompleteLogin(const std::string& username,
                                            const std::string& password) {
   SetOwnerUserInCryptohome();
@@ -362,6 +366,9 @@ void ExistingUserController::OnLoginFailure(const LoginFailure& failure) {
 
   if (login_status_consumer_)
     login_status_consumer_->OnLoginFailure(failure);
+
+  // Clear the recorded displayed email so it won't affect any future attempts.
+  next_login_display_email_.clear();
 }
 
 void ExistingUserController::OnLoginSuccess(
@@ -391,6 +398,7 @@ void ExistingUserController::OnLoginSuccess(
 
   // Will call OnProfilePrepared() in the end.
   LoginUtils::Get()->PrepareProfile(username,
+                                    next_login_display_email_,
                                     password,
                                     credentials,
                                     pending_requests,
@@ -398,6 +406,7 @@ void ExistingUserController::OnLoginSuccess(
                                     has_cookies,
                                     this);
 
+  next_login_display_email_.clear();
 
   // Notifiy LoginDisplay to allow it provide visual feedback to user.
   login_display_->OnLoginSuccess(username);