UMA metrics - number of accounts per profile and account reconciler.

components/signin/core/browser/signin_metrics.h

+// Copyright (c) 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_
+
+namespace signin_metrics {
+
+// Log to UMA histograms and UserCounts stats about a single execution of the
+// AccountReconciler.
+// |total_number_accounts| - How many accounts are in the browser for this
+//                           profile.
+// |count_added_to_cookie_jar| - How many accounts were in the browser but not
+//                               the cookie jar.
+// |count_added_to_token| - How may accounts were in the cookie jar but not in
+//                          the browser.
+// |primary_accounts_same| - False if the primary account for the cookie jar
+//                           and the token service were different; else true.
+// |is_first_reconcile| - True if these stats are from the first execution of
+//                        the AccountReconcilor.
+void LogSigninAccountReconciliation(int total_number_accounts,
+                                    int count_added_to_cookie_jar,
+                                    int count_added_to_token,
+                                    bool primary_accounts_same,
+                                    bool is_first_reconcile);
+
+}  // namespace signin_metrics
+
+#endif  // COMPONENTS_SIGNIN_CORE_BROWSER_SIGNIN_METRICS_H_