New Profile metric for Auth Errors.

components/signin/core/browser/signin_metrics.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 COMPONENTS_SIGNIN_CORE_BROWSER_SIGNIN_METRICS_H_
 #define COMPONENTS_SIGNIN_CORE_BROWSER_SIGNIN_METRICS_H_
 
 #include "base/time/time.h"
 
+#include "google_apis/gaia/google_service_auth_error.h"
+
 namespace signin_metrics {
 
 // Enum for the ways in which primary account detection is done.
 enum DifferentPrimaryAccounts {
   // token and cookie had same primary accounts.
   ACCOUNTS_SAME = 0,
   // Deprecated. Indicates different primary accounts.
   UNUSED_ACCOUNTS_DIFFERENT,
   // No GAIA cookie present, so the primaries are considered different.
   NO_COOKIE_PRESENT,
@@ skipping 137 matching lines @@
 // Track a profile signout.
 void LogSignout(ProfileSignout metric);
 
 // Tracks whether the external connection results were all fetched before
 // the reconcilor tried to use them with MergeSession.
 // |time_to_check_connections| is the time it took to complete.
 void LogExternalCcResultFetches(
     bool fetches_completed,
     const base::TimeDelta& time_to_check_connections);
 
+// Track when the current auth error changed.

[noms (inactive), 2015/01/08 21:49:04]

nit: since it fits, use "authentication" in the comment :)

[Mike Lerman, 2015/01/09 02:15:05]

Done.

+void LogAuthError(GoogleServiceAuthError::State auth_error);
+
 }  // namespace signin_metrics
 
 #endif  // COMPONENTS_SIGNIN_CORE_BROWSER_SIGNIN_METRICS_H_