[Sync] Add support for performing a GetKey on startup.

sync/tools/sync_client.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 <cstddef>
 #include <cstdio>
 #include <string>
 
 #include "base/at_exit.h"
 #include "base/base64.h"
@@ skipping 349 matching lines @@
                     blocking_task_runner,
                     post_factory.Pass(),
                     routing_info,
                     workers,
                     extensions_activity_monitor,
                     &change_delegate,
                     credentials,
                     scoped_ptr<syncer::SyncNotifier>(
                         sync_notifier_factory.CreateSyncNotifier()),
                     kRestoredKeyForBootstrapping,
+                    true,  // enable keystore encryption
                     kTestingMode,
                     &null_encryptor,
                     &unrecoverable_error_handler,
                     &LogUnrecoverableErrorContext);
   // TODO(akalin): We have pass in model parameters multiple times.
   // Organize handling of model types.
   sync_manager->UpdateEnabledTypes(model_types);
   sync_manager->StartSyncingNormally(routing_info);
 
   sync_loop.Run();
 
   io_thread.Stop();
   return 0;
 }