[SyncFS] Make DumpFiles async

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/threading/sequenced_worker_pool.h"
@@ skipping 283 matching lines @@
 RemoteServiceState SyncEngine::GetCurrentState() const {
   // TODO(peria): Post task
   return sync_worker_->GetCurrentState();
 }
 
 void SyncEngine::GetOriginStatusMap(OriginStatusMap* status_map) {
   // TODO(peria): Make this route asynchronous.
   sync_worker_->GetOriginStatusMap(status_map);
 }
 
-scoped_ptr<base::ListValue> SyncEngine::DumpFiles(const GURL& origin) {
-  // TODO(peria): Make this route asynchronous.
-  return sync_worker_->DumpFiles(origin);
+void SyncEngine::DumpFiles(const GURL& origin,
+                           const ListCallback& callback) {
+  PostTaskAndReplyWithResult(
+      worker_task_runner_,
+      FROM_HERE,
+      base::Bind(&SyncWorker::DumpFiles,
+                 base::Unretained(sync_worker_.get()),
+                 origin),
+      callback);
 }
 
 scoped_ptr<base::ListValue> SyncEngine::DumpDatabase() {
   // TODO(peria): Make this route asynchronous.
   return sync_worker_->DumpDatabase();
 }
 
 void SyncEngine::SetSyncEnabled(bool enabled) {
   worker_task_runner_->PostTask(
       FROM_HERE,
@@ skipping 205 matching lines @@
         tracker.tracker_kind() == TRACKER_KIND_APP_ROOT;
     if (is_app_enabled && !is_app_root_tracker_enabled)
       EnableOrigin(origin, base::Bind(&EmptyStatusCallback));
     else if (!is_app_enabled && is_app_root_tracker_enabled)
       DisableOrigin(origin, base::Bind(&EmptyStatusCallback));
   }
 }
 
 }  // namespace drive_backend
 }  // namespace sync_file_system