[SyncFS] Make GetOriginStatusMap asynchronous

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/metrics/histogram.h"
@@ skipping 331 matching lines @@
 
 bool SyncEngine::IsConflicting(const fileapi::FileSystemURL& url) {
   // TODO(tzik): Implement this before we support manual conflict resolution.
   return false;
 }
 
 RemoteServiceState SyncEngine::GetCurrentState() const {
   return service_state_;
 }
 
-void SyncEngine::GetOriginStatusMap(OriginStatusMap* status_map) {
-  // TODO(peria): Make this route asynchronous.
-  sync_worker_->GetOriginStatusMap(status_map);
+void SyncEngine::GetOriginStatusMap(const StatusMapCallback& callback) {
+  worker_task_runner_->PostTask(
+      FROM_HERE,
+      base::Bind(&SyncWorker::GetOriginStatusMap,
+                 base::Unretained(sync_worker_.get()),
+                 RelayCallbackToCurrentThread(
+                     FROM_HERE, callback)));
 }
 
 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),
@@ skipping 217 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