Handles unknown signin status and collect more stats.

chrome/browser/metrics/signin_status_metrics_provider.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_METRICS_SIGNIN_STATUS_METRICS_PROVIDER_H_
 #define CHROME_BROWSER_METRICS_SIGNIN_STATUS_METRICS_PROVIDER_H_
 
 #include <string>
 
 #include "base/gtest_prod_util.h"
@@ skipping 43 matching lines @@
   FRIEND_TEST_ALL_PREFIXES(SigninStatusMetricsProvider, GoogleSignedOut);
 
   // Possible sign-in status of all opened profiles during one UMA session. For
   // MIXED_SIGNIN_STATUS, at least one signed-in profile and at least one
   // unsigned-in profile were opened between two UMA log uploads.
   enum ProfilesSigninStatus {
     ALL_PROFILES_SIGNED_IN,
     ALL_PROFILES_NOT_SIGNED_IN,
     MIXED_SIGNIN_STATUS,
     UNKNOWN_SIGNIN_STATUS,
+    ERROR_GETTING_SIGNIN_STATUS,
     SIGNIN_STATUS_MAX,
   };
 
   // chrome::BrowserListObserver:
   // This will never be called on Android.
   virtual void OnBrowserAdded(Browser* browser) OVERRIDE;
 
   // SigninManagerFactory::Observer:
   virtual void SigninManagerCreated(SigninManagerBase* manager) OVERRIDE;
   virtual void SigninManagerShutdown(SigninManagerBase* manager) OVERRIDE;
@@ skipping 34 matching lines @@
 
   // Whether the instance is for testing or not.
   bool is_test_;
 
   base::WeakPtrFactory<SigninStatusMetricsProvider> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SigninStatusMetricsProvider);
 };
 
 #endif  // CHROME_BROWSER_METRICS_SIGNIN_STATUS_METRICS_PROVIDER_H_