[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"
+#include "google_apis/gaia/gaia_auth_util.h"
+#include "google_apis/gaia/gaia_urls.h"
+
+namespace password_manager_sync_metrics {
+
+std::string GetPasswordSyncUsername(Profile* profile) {
+  ProfileSyncService* sync_service =
+      ProfileSyncServiceFactory::GetForProfile(profile);
+  if (!sync_service ||
+      !sync_service->HasSyncSetupCompleted() ||
+      !sync_service->GetActiveDataTypes().Has(syncer::PASSWORDS))
+    return "";
+
+  SigninManagerBase* signin_manager =
+      SigninManagerFactory::GetForProfile(profile);
+  if (!signin_manager)
+    return "";
+
+  return signin_manager->GetAuthenticatedUsername();
+}
+
+bool IsPasswordSyncAccountCredential(Profile* profile,
+                                     const std::string& username,
+                                     const std::string& origin) {
+  if (origin != GaiaUrls::GetInstance()->gaia_url().GetOrigin().spec())
+    return false;
+
+  return gaia::AreEmailsSame(username, GetPasswordSyncUsername(profile));
+}
+
+}  // namespace password_manager_sync_metrics