Enrollment recovery: Add UMA stats.

chrome/browser/chromeos/login/enrollment/enrollment_screen_actor.h

 // 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.
 
 #ifndef CHROME_BROWSER_CHROMEOS_LOGIN_ENROLLMENT_ENROLLMENT_SCREEN_ACTOR_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_ENROLLMENT_ENROLLMENT_SCREEN_ACTOR_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 11 matching lines @@
   // are not covered by GoogleServiceAuthError or EnrollmentStatus.
   enum UIError {
     // Existing enrollment domain doesn't match authentication user.
     UI_ERROR_DOMAIN_MISMATCH,
     // Requested device mode not supported with auto enrollment.
     UI_ERROR_AUTO_ENROLLMENT_BAD_MODE,
     // Unexpected error condition, indicates a bug in the code.
     UI_ERROR_FATAL,
   };
 
-  // Describes the enrollment mode.
+  // Describes the enrollment mode.  Must be kept in sync with
+  // |kEnrollmentModes| in enrollment_screen_handler.cc.
   enum EnrollmentMode {
-    ENROLLMENT_MODE_MANUAL,  // Manually triggered enrollment.
-    ENROLLMENT_MODE_FORCED,  // Forced enrollment, user can't skip.
-    ENROLLMENT_MODE_AUTO,    // Auto-enrollment during first sign-in.
+    ENROLLMENT_MODE_MANUAL,    // Manually triggered enrollment.
+    ENROLLMENT_MODE_FORCED,    // Forced enrollment, user can't skip.
+    ENROLLMENT_MODE_AUTO,      // Auto-enrollment during first sign-in.
+    ENROLLMENT_MODE_RECOVERY,  // Recover from "spontaneous unenrollment".
+    ENROLLMENT_MODE_COUNT      // Counter must be last. Not an enrollment mode.
   };
 
   // This defines the interface for controllers which will be called back when
   // something happens on the UI.
   class Controller {
    public:
     virtual ~Controller() {}
 
     virtual void OnLoginDone(const std::string& user) = 0;
     virtual void OnAuthError(const GoogleServiceAuthError& error) = 0;
@@ skipping 41 matching lines @@
   // Show non-authentication error.
   virtual void ShowUIError(UIError error) = 0;
 
   // Update the UI to report the |status| of the enrollment procedure.
   virtual void ShowEnrollmentStatus(policy::EnrollmentStatus status) = 0;
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_ENROLLMENT_ENROLLMENT_SCREEN_ACTOR_H_