[Password Manager] Add UMA stats to track interaction with synced accounts.

chrome/browser/password_manager/sync_metrics.cc

+// 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.
+
+#include "chrome/browser/password_manager/sync_metrics.h"
+
+#include "chrome/browser/signin/signin_manager_factory.h"
+#include "chrome/browser/sync/profile_sync_service.h"
+#include "chrome/browser/sync/profile_sync_service_factory.h"
+#include "components/signin/core/browser/signin_manager.h"
+
+namespace password_manager_sync_metrics {
+
+void GetSyncUsernameAndState(Profile* profile,
+                             std::string* username,
+                             password_manager::SyncState* sync_state) {
+  *sync_state = password_manager::NOT_SYNCING;
+
+  ProfileSyncService* sync_service =
+      ProfileSyncServiceFactory::GetForProfile(profile);
+  if (!sync_service || !sync_service->HasSyncSetupCompleted())
+    return;
+
+  if (sync_service->GetActiveDataTypes().Has(syncer::PASSWORDS)) {
+    *sync_state = password_manager::PASSWORD_SYNC_ENABLED;
+  } else {
+    *sync_state = password_manager::PASSWORD_SYNC_DISABLED;
+  }
+
+  SigninManagerBase* signin_manager =
+      SigninManagerFactory::GetForProfile(profile);
+  if (signin_manager)
+    *username = signin_manager->GetAuthenticatedUsername();
+}
+
+}  // namespace password_manager_sync_metrics