sync: Gracefully handle very early shutdown

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/command_line.h"
 #include "base/compiler_specific.h"
 #include "base/debug/stack_trace.h"
 #include "base/files/scoped_temp_dir.h"
 #include "base/json/json_writer.h"
 #include "base/logging.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/rand_util.h"
 #include "base/task_runner.h"
 #include "base/threading/thread.h"
 #include "jingle/notifier/base/notification_method.h"
 #include "jingle/notifier/base/notifier_options.h"
 #include "net/base/host_port_pair.h"
 #include "net/base/network_change_notifier.h"
 #include "net/dns/host_resolver.h"
 #include "net/http/transport_security_state.h"
 #include "net/url_request/url_request_test_util.h"
+#include "sync/internal_api/public/base/cancellation_signal.h"
 #include "sync/internal_api/public/base/model_type.h"
 #include "sync/internal_api/public/base_node.h"
 #include "sync/internal_api/public/engine/passive_model_worker.h"
 #include "sync/internal_api/public/http_bridge.h"
 #include "sync/internal_api/public/internal_components_factory_impl.h"
 #include "sync/internal_api/public/read_node.h"
 #include "sync/internal_api/public/sync_manager.h"
 #include "sync/internal_api/public/sync_manager_factory.h"
 #include "sync/internal_api/public/util/report_unrecoverable_error_function.h"
 #include "sync/internal_api/public/util/unrecoverable_error_handler.h"
@@ skipping 303 matching lines @@
   // as NULL.
   ExtensionsActivity* extensions_activity = NULL;
   LoggingChangeDelegate change_delegate;
   const char kRestoredKeyForBootstrapping[] = "";
   const char kRestoredKeystoreKeyForBootstrapping[] = "";
   NullEncryptor null_encryptor;
   InternalComponentsFactoryImpl::Switches factory_switches = {
       InternalComponentsFactory::ENCRYPTION_KEYSTORE,
       InternalComponentsFactory::BACKOFF_NORMAL
   };
+  CancellationSignal cancellation_signal;
 
   sync_manager->Init(database_dir.path(),
                     WeakHandle<JsEventHandler>(
                         js_event_handler.AsWeakPtr()),
                     kSyncServerAndPath,
                     kSyncServerPort,
                     kUseSsl,
                     post_factory.Pass(),
                     workers,
                     extensions_activity,
                     &change_delegate,
                     credentials,
                     invalidator_id,
                     kRestoredKeyForBootstrapping,
                     kRestoredKeystoreKeyForBootstrapping,
                     new InternalComponentsFactoryImpl(factory_switches),
                     &null_encryptor,
                     scoped_ptr<UnrecoverableErrorHandler>(
                         new LoggingUnrecoverableErrorHandler).Pass(),
-                    &LogUnrecoverableErrorContext, false);
+                    &LogUnrecoverableErrorContext, false,
+                    &cancellation_signal);
   // TODO(akalin): Avoid passing in model parameters multiple times by
   // organizing handling of model types.
   invalidator->UpdateCredentials(credentials.email, credentials.sync_token);
   invalidator->RegisterHandler(sync_manager.get());
   invalidator->UpdateRegisteredIds(
       sync_manager.get(), ModelTypeSetToObjectIdSet(model_types));
   sync_manager->StartSyncingNormally(routing_info);
 
   sync_loop.Run();
 
   io_thread.Stop();
   return 0;
 }
 
 }  // namespace
 }  // namespace syncer
 
 int main(int argc, char* argv[]) {
   return syncer::SyncClientMain(argc, argv);
 }