[SyncFS] Restore refresh token availability on re-initialize of SyncEngine

chrome/browser/sync_file_system/drive_backend/sync_engine.cc

 // Copyright 2013 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/sync_file_system/drive_backend/sync_engine.h"
 
 #include <vector>
 
 #include "base/bind.h"
 #include "base/metrics/histogram.h"
@@ skipping 336 matching lines @@
                  base::Unretained(sync_worker_.get()),
                  base::Passed(&sync_engine_context)));
   if (remote_change_processor_)
     SetRemoteChangeProcessor(remote_change_processor_);
 
   drive_service_->AddObserver(this);
 
   service_state_ = REMOTE_SERVICE_TEMPORARY_UNAVAILABLE;
   SetSyncEnabled(sync_enabled_);
   OnNetworkChanged(net::NetworkChangeNotifier::GetConnectionType());
+  if (drive_service_->HasRefreshToken())
+    OnReadyToSendRequests();
+  else
+    OnRefreshTokenInvalid();
 }
 
 void SyncEngine::AddServiceObserver(SyncServiceObserver* observer) {
   service_observers_.AddObserver(observer);
 }
 
 void SyncEngine::AddFileStatusObserver(FileStatusObserver* observer) {
   file_status_observers_.AddObserver(observer);
 }
 
@@ skipping 406 matching lines @@
 
 SyncStatusCallback SyncEngine::TrackCallback(
     const SyncStatusCallback& callback) {
   return callback_tracker_.Register(
       base::Bind(callback, SYNC_STATUS_ABORT),
       callback);
 }
 
 }  // namespace drive_backend
 }  // namespace sync_file_system