cros: Add enterprise user session metrics

chrome/browser/chromeos/login/signin_specifics.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_SIGNIN_SPECIFICS_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_SIGNIN_SPECIFICS_H_
 
 #include <string>
 
 namespace chromeos {
 
 // This structure encapsulates some specific parameters of signin flows that are
-// not
-// general enough to be put to UserContext.
+// not general enough to be put to UserContext.
 struct SigninSpecifics {
-  SigninSpecifics();
+  SigninSpecifics() {}
 
   // Specifies url that should be shown during Guest signin.
   std::string guest_mode_url;
 
   // Specifies if locale should be passed to guest mode url.
-  bool guest_mode_url_append_locale;
+  bool guest_mode_url_append_locale = false;
 
   // Controls diagnostic mode for Kiosk App signin.
-  bool kiosk_diagnostic_mode;
+  bool kiosk_diagnostic_mode = false;
+
+  // Whether it is an automatic login.
+  bool is_auto_login = false;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_SIGNIN_SPECIFICS_H_