Add user metrics for the login screen.

chrome/browser/chromeos/login/login_status_consumer.h

 // Copyright (c) 2010 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_LOGIN_STATUS_CONSUMER_H_
 #define CHROME_BROWSER_CHROMEOS_LOGIN_LOGIN_STATUS_CONSUMER_H_
 #pragma once
 
 #include <string>
 #include "chrome/common/net/gaia/gaia_auth_consumer.h"
 #include "chrome/common/net/gaia/google_service_auth_error.h"
 #include "net/base/net_errors.h"
 
 namespace chromeos {
 
 class LoginFailure {
  public:
   enum FailureReason {
     NONE,
     COULD_NOT_MOUNT_CRYPTOHOME,
     COULD_NOT_MOUNT_TMPFS,
     COULD_NOT_UNMOUNT_CRYPTOHOME,
     DATA_REMOVAL_FAILED,  // Could not destroy your old data
     LOGIN_TIMED_OUT,
     UNLOCK_FAILED,
     NETWORK_AUTH_FAILED,  // Could not authenticate against Google
+    NUM_FAILURE_REASONS,  // This has to be the last item.
   };
 
   explicit LoginFailure(FailureReason reason)
       : reason_(reason),
         error_(GoogleServiceAuthError::NONE) {
     DCHECK(reason != NETWORK_AUTH_FAILED);
   }
 
   inline bool operator==(const LoginFailure &b) const {
     if (reason_ != b.reason_) {
@@ skipping 74 matching lines @@
   // The same password didn't work both online and offline.
   virtual void OnPasswordChangeDetected(
       const GaiaAuthConsumer::ClientLoginResult& credentials) {
     NOTREACHED();
   };
 };
 
 }  // namespace chromeos
 
 #endif  // CHROME_BROWSER_CHROMEOS_LOGIN_LOGIN_STATUS_CONSUMER_H_