[ew] Add basic classes.

chrome/browser/sync_file_system/local/sync_file_system_backend.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/local/sync_file_system_backend.h"
 
+#include <string>
+
 #include "base/logging.h"
 #include "chrome/browser/chrome_notification_types.h"
 #include "chrome/browser/sync_file_system/local/local_file_change_tracker.h"
 #include "chrome/browser/sync_file_system/local/local_file_sync_context.h"
 #include "chrome/browser/sync_file_system/local/syncable_file_system_operation.h"
 #include "chrome/browser/sync_file_system/sync_file_system_service.h"
 #include "chrome/browser/sync_file_system/sync_file_system_service_factory.h"
 #include "chrome/browser/sync_file_system/syncable_file_system_util.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/notification_service.h"
@@ skipping 115 matching lines @@
                  mode,
                  callback);
   InitializeSyncFileSystemService(url.origin(), initialize_callback);
 }
 
 fileapi::AsyncFileUtil* SyncFileSystemBackend::GetAsyncFileUtil(
     fileapi::FileSystemType type) {
   return GetDelegate()->file_util();
 }
 
+fileapi::WatcherManager* SyncFileSystemBackend::GetWatcherManager(
+    fileapi::FileSystemType type) {
+  return NULL;
+}
+
 fileapi::CopyOrMoveFileValidatorFactory*
 SyncFileSystemBackend::GetCopyOrMoveFileValidatorFactory(
     fileapi::FileSystemType type,
     base::File::Error* error_code) {
   DCHECK(error_code);
   *error_code = base::File::FILE_OK;
   return NULL;
 }
 
 fileapi::FileSystemOperation*
@@ skipping 138 matching lines @@
                  SyncStatusCodeToFileError(status));
     return;
   }
 
   callback.Run(GetSyncableFileSystemRootURI(origin_url),
                GetFileSystemName(origin_url, type),
                base::File::FILE_OK);
 }
 
 }  // namespace sync_file_system