Keep sync tasks alive as long as it's not finished

chrome/browser/chromeos/drive/sync/entry_update_performer.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/chromeos/drive/sync/entry_update_performer.h"
 
 #include "base/callback_helpers.h"
 #include "base/file_util.h"
 #include "chrome/browser/chromeos/drive/change_list_loader.h"
 #include "chrome/browser/chromeos/drive/drive.pb.h"
@@ skipping 236 matching lines @@
   // Trashed entry should be removed.
   if (local_state->entry.parent_local_id() == util::kDriveTrashDirLocalId) {
     remove_performer_->Remove(local_state->entry.local_id(), context, callback);
     return;
   }
 
   // Parent was locally created and needs update. Just return for now.
   // This entry should be updated again after the parent update completes.
   if (local_state->parent_entry.resource_id().empty() &&
       local_state->parent_entry.metadata_edit_state() != ResourceEntry::CLEAN) {
-    callback.Run(FILE_ERROR_OK);
+    callback.Run(FILE_ERROR_PARENT_NEEDS_TO_BE_SYNCED);
     return;
   }
 
   base::Time last_modified = base::Time::FromInternalValue(
       local_state->entry.file_info().last_modified());
   base::Time last_accessed = base::Time::FromInternalValue(
       local_state->entry.file_info().last_accessed());
 
   // Perform content update.
   if (local_state->should_content_update) {
@@ skipping 129 matching lines @@
     FileError error) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   DCHECK(!callback.is_null());
 
   observer_->OnFileChangedByOperation(*changed_files);
   callback.Run(error);
 }
 
 }  // namespace internal
 }  // namespace drive