[SyncFS] Make GetOriginStatusMap asynchronous

chrome/browser/ui/webui/sync_file_system_internals/file_metadata_handler.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/ui/webui/sync_file_system_internals/file_metadata_handler.h"
 
 #include <map>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 49 matching lines @@
       SyncFileSystemServiceFactory::GetForProfile(profile_);
   if (!sync_service)
     return;
   sync_service->DumpFiles(origin,
                           base::Bind(&FileMetadataHandler::DidGetFileMetadata,
                                      weak_factory_.GetWeakPtr()));
 }
 
 void FileMetadataHandler::GetExtensions(const base::ListValue* args) {
   DCHECK(args);
-  base::ListValue list;
-  ExtensionStatusesHandler::GetExtensionStatusesAsDictionary(profile_, &list);
+  ExtensionStatusesHandler::GetExtensionStatusesAsDictionary(
+      profile_,
+      base::Bind(&FileMetadataHandler::DidGetExtensions,
+                 weak_factory_.GetWeakPtr()));
+}
+
+void FileMetadataHandler::DidGetExtensions(const base::ListValue& list) {
   web_ui()->CallJavascriptFunction("FileMetadata.onGetExtensions", list);
 }
 
 void FileMetadataHandler::DidGetFileMetadata(const base::ListValue& files) {
   web_ui()->CallJavascriptFunction("FileMetadata.onGetFileMetadata", files);
 }
 
 }  // namespace syncfs_internals