[ew] Add basic classes.

chrome/browser/chromeos/drive/fileapi/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/drive/fileapi/file_system_backend_delegate.h"
 
 #include "base/bind.h"
 #include "base/files/file_path.h"
 #include "base/memory/scoped_ptr.h"
 #include "chrome/browser/chromeos/drive/file_system_util.h"
@@ skipping 62 matching lines @@
     return scoped_ptr<storage::FileStreamWriter>();
 
   return scoped_ptr<storage::FileStreamWriter>(
       new internal::WebkitFileStreamWriterImpl(
           base::Bind(&fileapi_internal::GetFileSystemFromUrl, url),
           context->default_file_task_runner(),
           file_path,
           offset));
 }
 
+storage::WatcherManager* FileSystemBackendDelegate::GetWatcherManager(
+    const storage::FileSystemURL& url) {
+  NOTIMPLEMENTED();
+  return NULL;
+}
+
 }  // namespace drive