[SyncFS] SyncWorker cache refresh token status

chrome/browser/sync_file_system/drive_backend/sync_worker.h

Index: chrome/browser/sync_file_system/drive_backend/sync_worker.h
diff --git a/chrome/browser/sync_file_system/drive_backend/sync_worker.h b/chrome/browser/sync_file_system/drive_backend/sync_worker.h
index 55ce5516f30d2d029f0abdb3c8f5479c41348f2b..64f0312dc62de4148ce8c1ebaafc7823e044a1f6 100644
--- a/chrome/browser/sync_file_system/drive_backend/sync_worker.h
+++ b/chrome/browser/sync_file_system/drive_backend/sync_worker.h
@@ -138,6 +138,8 @@ class SyncWorker : public SyncTaskManager::Client {
   void AddObserver(Observer* observer);
 
  private:
+  friend class SyncEngineTest;
+
   void DoDisableApp(const std::string& app_id,
                     const SyncStatusCallback& callback);
   void DoEnableApp(const std::string& app_id,
@@ -188,6 +190,8 @@ class SyncWorker : public SyncTaskManager::Client {
   scoped_ptr<SyncEngineContext> context_;
   ObserverList<Observer> observers_;
 
+  bool has_refresh_token_;
+
   base::WeakPtrFactory<SyncWorker> weak_ptr_factory_;
   DISALLOW_COPY_AND_ASSIGN(SyncWorker);
 };