[NOCOMMIT] Make DriveService{Wrapper|Messenger} class

chrome/browser/sync_file_system/drive_backend/sync_engine.h

Index: chrome/browser/sync_file_system/drive_backend/sync_engine.h
diff --git a/chrome/browser/sync_file_system/drive_backend/sync_engine.h b/chrome/browser/sync_file_system/drive_backend/sync_engine.h
index e9de24861219ad3ae94805c22f52b4a763afa33b..355bb68d7791386da8495543d133f31cdbbd7485 100644
--- a/chrome/browser/sync_file_system/drive_backend/sync_engine.h
+++ b/chrome/browser/sync_file_system/drive_backend/sync_engine.h
@@ -41,6 +41,7 @@ class RemoteChangeProcessor;
 
 namespace drive_backend {
 
+class DriveServiceWrapper;
 class LocalToRemoteSyncer;
 class MetadataDatabase;
 class RemoteToLocalSyncer;
@@ -65,6 +66,7 @@ class SyncEngine : public RemoteFileSyncService,
 
   void Initialize(const base::FilePath& base_dir,
                   base::SequencedTaskRunner* file_task_runner,
+                  bool pass_service_to_worker,
                   leveldb::Env* env_override);
 
   // RemoteFileSyncService overrides.
@@ -163,6 +165,7 @@ class SyncEngine : public RemoteFileSyncService,
   void NotifyLastOperationStatus();
 
   scoped_ptr<drive::DriveServiceInterface> drive_service_;
+  scoped_ptr<DriveServiceWrapper> drive_service_wrapper_;
   scoped_ptr<drive::DriveUploaderInterface> drive_uploader_;
 
   // These external services are not owned by SyncEngine.