cros: Add enterprise user session metrics

chrome/browser/chromeos/login/existing_user_controller.h

Index: chrome/browser/chromeos/login/existing_user_controller.h
diff --git a/chrome/browser/chromeos/login/existing_user_controller.h b/chrome/browser/chromeos/login/existing_user_controller.h
index ab77a45626fea18d2a5f9680234306825baa24d1..6a32f38dc573b91b98ebaf631bc5938a80317f5f 100644
--- a/chrome/browser/chromeos/login/existing_user_controller.h
+++ b/chrome/browser/chromeos/login/existing_user_controller.h
@@ -143,6 +143,8 @@ class ExistingUserController
   friend class ExistingUserControllerPublicSessionTest;
   friend class MockLoginPerformerDelegate;
 
+  FRIEND_TEST_ALL_PREFIXES(ExistingUserControllerTest, ExistingUserLogin);
+
   void LoginAsGuest();
   void LoginAsPublicSession(const UserContext& user_context);
   void LoginAsKioskApp(const std::string& app_id, bool diagnostic_mode);
@@ -289,6 +291,9 @@ class ExistingUserController
   // AccountId of the last login attempt.
   AccountId last_login_attempt_account_id_ = EmptyAccountId();
 
+  // Whether the last login attempt was an auto login.
+  bool last_login_attempt_was_auto_login_ = false;
+
   // OOBE/login display host.
   LoginDisplayHost* host_;
 
@@ -370,8 +375,6 @@ class ExistingUserController
 
   std::unique_ptr<TokenHandleUtil> token_handle_util_;
 
-  FRIEND_TEST_ALL_PREFIXES(ExistingUserControllerTest, ExistingUserLogin);
-
   // Factory of callbacks.
   base::WeakPtrFactory<ExistingUserController> weak_factory_;