[SyncFS] Make SyncEngineInitializer run as a background task (3/3)

chrome/browser/sync_file_system/drive_backend/sync_engine_initializer.h

 // 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.
 
 #ifndef CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_SYNC_ENGINE_INITIALIZER_H_
 #define CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_SYNC_ENGINE_INITIALIZER_H_
 
 #include <string>
 
 #include "base/memory/ref_counted.h"
@@ skipping 46 matching lines @@
 //    we find the folder in the Drive root folder, handle it as the sync-root
 //    folder.
 //  - Create the remote sync-root folder if we don't have.
 //  - Detach the remote sync-root folder from its parent if it has.
 //  - Fetch the folder contents of the remote sync-root folder.
 //    The contents are likely registered as app-root folders, but handle them
 //    as regular inactive folders until they are registered explicitly.
 //  - Populate database with the largest change ID, the sync-root folder and
 //    its contents.
 //
-class SyncEngineInitializer : public SequentialSyncTask {
+class SyncEngineInitializer : public SyncTask {
  public:
   SyncEngineInitializer(SyncEngineContext* sync_context,
                         base::SequencedTaskRunner* task_runner,
                         drive::DriveServiceInterface* drive_service,
                         const base::FilePath& database_path,
                         leveldb::Env* env_override);
   virtual ~SyncEngineInitializer();
-  virtual void RunSequential(const SyncStatusCallback& callback) OVERRIDE;
+  virtual void Run(scoped_ptr<SyncTaskToken> token) OVERRIDE;
 
   scoped_ptr<MetadataDatabase> PassMetadataDatabase();
 
  private:
   typedef base::Callback<void(const SyncStatusCallback& callback)> Task;
 
-  void DidCreateMetadataDatabase(const SyncStatusCallback& callback,
+  void DidCreateMetadataDatabase(scoped_ptr<SyncTaskToken> token,
                                  SyncStatusCode status,
                                  scoped_ptr<MetadataDatabase> instance);
 
-  void GetAboutResource(const SyncStatusCallback& callback);
+  void GetAboutResource(scoped_ptr<SyncTaskToken> token);
   void DidGetAboutResource(
-      const SyncStatusCallback& callback,
+      scoped_ptr<SyncTaskToken> token,
       google_apis::GDataErrorCode error,
       scoped_ptr<google_apis::AboutResource> about_resource);
-  void FindSyncRoot(const SyncStatusCallback& callback);
-  void DidFindSyncRoot(const SyncStatusCallback& callback,
+  void FindSyncRoot(scoped_ptr<SyncTaskToken> token);
+  void DidFindSyncRoot(scoped_ptr<SyncTaskToken> token,
                        google_apis::GDataErrorCode error,
                        scoped_ptr<google_apis::ResourceList> resource_list);
-  void CreateSyncRoot(const SyncStatusCallback& callback);
-  void DidCreateSyncRoot(const SyncStatusCallback& callback,
+  void CreateSyncRoot(scoped_ptr<SyncTaskToken> token);
+  void DidCreateSyncRoot(scoped_ptr<SyncTaskToken> token,
                          google_apis::GDataErrorCode error,
                          scoped_ptr<google_apis::ResourceEntry> entry);
-  void DetachSyncRoot(const SyncStatusCallback& callback);
-  void DidDetachSyncRoot(const SyncStatusCallback& callback,
+  void DetachSyncRoot(scoped_ptr<SyncTaskToken> token);
+  void DidDetachSyncRoot(scoped_ptr<SyncTaskToken> token,
                          google_apis::GDataErrorCode error);
-  void ListAppRootFolders(const SyncStatusCallback& callback);
+  void ListAppRootFolders(scoped_ptr<SyncTaskToken> token);
   void DidListAppRootFolders(
-      const SyncStatusCallback& callback,
+      scoped_ptr<SyncTaskToken> token,
       google_apis::GDataErrorCode error,
       scoped_ptr<google_apis::ResourceList> resource_list);
-  void PopulateDatabase(const SyncStatusCallback& callback);
-  void DidPopulateDatabase(const SyncStatusCallback& callback,
+  void PopulateDatabase(scoped_ptr<SyncTaskToken> token);
+  void DidPopulateDatabase(scoped_ptr<SyncTaskToken> token,
                            SyncStatusCode status);
 
   SyncEngineContext* sync_context_;  // Not owned.
   leveldb::Env* env_override_;
 
   scoped_refptr<base::SequencedTaskRunner> task_runner_;
   drive::DriveServiceInterface* drive_service_;
   google_apis::CancelCallback cancel_callback_;
   base::FilePath database_path_;
 
   int find_sync_root_retry_count_;
 
   scoped_ptr<MetadataDatabase> metadata_database_;
   ScopedVector<google_apis::ResourceEntry> app_root_folders_;
 
   int64 largest_change_id_;
   std::string root_folder_id_;
 
   scoped_ptr<google_apis::ResourceEntry> sync_root_folder_;
 
   base::WeakPtrFactory<SyncEngineInitializer> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SyncEngineInitializer);
 };
 
 }  // namespace drive_backend
 }  // namespace sync_file_system
 
 #endif  // CHROME_BROWSER_SYNC_FILE_SYSTEM_DRIVE_BACKEND_SYNC_ENGINE_INITIALIZER_H_