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

chrome/browser/password_manager/password_store_factory.cc

 // Copyright (c) 2012 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/password_store_factory.h"
 
 #include "base/command_line.h"
 #include "base/environment.h"
 #include "base/prefs/pref_service.h"
+#include "chrome/browser/password_manager/sync_metrics.h"
 #include "chrome/browser/profiles/incognito_helpers.h"
 #include "chrome/browser/sync/glue/sync_start_util.h"
 #include "chrome/browser/webdata/web_data_service.h"
 #include "chrome/browser/webdata/web_data_service_factory.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_switches.h"
 #include "components/keyed_service/content/browser_context_dependency_manager.h"
 #include "components/os_crypt/os_crypt_switches.h"
 #include "components/password_manager/core/browser/login_database.h"
 #include "components/password_manager/core/browser/password_store.h"
@@ skipping 198 matching lines @@
   ps = new PasswordStoreX(main_thread_runner,
                           db_thread_runner,
                           login_db.release(),
                           backend.release());
 #elif defined(USE_OZONE)
   ps = new password_manager::PasswordStoreDefault(
       main_thread_runner, db_thread_runner, login_db.release());
 #else
   NOTIMPLEMENTED();
 #endif
+  std::string sync_username =
+      password_manager_sync_metrics::GetPasswordSyncUsername(profile);
   if (!ps || !ps->Init(
-          sync_start_util::GetFlareForSyncableService(profile->GetPath()))) {
+          sync_start_util::GetFlareForSyncableService(profile->GetPath()),
+          sync_username)) {
     NOTREACHED() << "Could not initialize password manager.";
     return NULL;
   }
 
   return new PasswordStoreService(ps);
 }
 
 void PasswordStoreFactory::RegisterProfilePrefs(
     user_prefs::PrefRegistrySyncable* registry) {
 #if !defined(OS_CHROMEOS) && defined(USE_X11)
   // Notice that the preprocessor conditions above are exactly those that will
   // result in using PasswordStoreX in BuildServiceInstanceFor().
   registry->RegisterIntegerPref(
       password_manager::prefs::kLocalProfileId,
       kInvalidLocalProfileId,
       user_prefs::PrefRegistrySyncable::UNSYNCABLE_PREF);
 #endif
 }
 
 content::BrowserContext* PasswordStoreFactory::GetBrowserContextToUse(
     content::BrowserContext* context) const {
   return chrome::GetBrowserContextRedirectedInIncognito(context);
 }
 
 bool PasswordStoreFactory::ServiceIsNULLWhileTesting() const {
   return true;
 }