[ew] Add basic classes.

chrome/browser/chromeos/fileapi/mtp_file_system_backend_delegate.cc

 // Copyright 2014 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/fileapi/mtp_file_system_backend_delegate.h"
 #include "chrome/browser/media_galleries/fileapi/device_media_async_file_util.h"
 #include "webkit/browser/blob/file_stream_reader.h"
 #include "webkit/browser/fileapi/file_stream_writer.h"
 #include "webkit/browser/fileapi/file_system_url.h"
 
@@ skipping 32 matching lines @@
 MTPFileSystemBackendDelegate::CreateFileStreamWriter(
     const storage::FileSystemURL& url,
     int64 offset,
     storage::FileSystemContext* context) {
   DCHECK_EQ(storage::kFileSystemTypeDeviceMediaAsFileStorage, url.type());
 
   // TODO(kinaba): support writing.
   return scoped_ptr<storage::FileStreamWriter>();
 }
 
+storage::WatcherManager* MTPFileSystemBackendDelegate::GetWatcherManager(
+    const storage::FileSystemURL& url) {
+  NOTIMPLEMENTED();
+  return NULL;
+}
+
 }  // namespace chromeos