[Sync] Fix auth error handling while the backend is initializing.

chrome/browser/sync/glue/sync_backend_host.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 "build/build_config.h"
 
 #include "chrome/browser/sync/glue/sync_backend_host.h"
 
 #include <algorithm>
 #include <map>
@@ skipping 442 matching lines @@
       sync_manager_factory,
       delete_sync_data_folder,
       sync_prefs_->GetEncryptionBootstrapToken(),
       sync_prefs_->GetKeystoreEncryptionBootstrapToken(),
       new InternalComponentsFactoryImpl(factory_switches),
       unrecoverable_error_handler,
       report_unrecoverable_error_function));
 }
 
 void SyncBackendHost::UpdateCredentials(const SyncCredentials& credentials) {
+  DCHECK(sync_thread_.IsRunning());
   sync_thread_.message_loop()->PostTask(FROM_HERE,
       base::Bind(&SyncBackendHost::Core::DoUpdateCredentials, core_.get(),
                  credentials));
 }
 
 void SyncBackendHost::UpdateRegisteredInvalidationIds(
     const syncer::ObjectIdSet& ids) {
   DCHECK_EQ(MessageLoop::current(), frontend_loop_);
   DCHECK(sync_thread_.IsRunning());
   sync_thread_.message_loop()->PostTask(FROM_HERE,
       base::Bind(&SyncBackendHost::Core::DoUpdateRegisteredInvalidationIds,
                  core_.get(), ids));
 }
 
 void SyncBackendHost::StartSyncingWithServer() {
   SDVLOG(1) << "SyncBackendHost::StartSyncingWithServer called.";
 
   syncer::ModelSafeRoutingInfo routing_info;
   registrar_->GetModelSafeRoutingInfo(&routing_info);
 
   sync_thread_.message_loop()->PostTask(FROM_HERE,
       base::Bind(&SyncBackendHost::Core::DoStartSyncing,
                  core_.get(), routing_info));
 }
 
 void SyncBackendHost::SetEncryptionPassphrase(const std::string& passphrase,
                                               bool is_explicit) {
+  DCHECK(sync_thread_.IsRunning());
   if (!IsNigoriEnabled()) {
     NOTREACHED() << "SetEncryptionPassphrase must never be called when nigori"
                     " is disabled.";
     return;
   }
 
   // We should never be called with an empty passphrase.
   DCHECK(!passphrase.empty());
 
   // This should only be called by the frontend.
@@ skipping 1084 matching lines @@
   DCHECK_EQ(MessageLoop::current(), frontend_loop_);
 
   frontend_->OnConnectionStatusChange(status);
 }
 
 #undef SDVLOG
 
 #undef SLOG
 
 }  // namespace browser_sync