[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 55 matching lines @@
   DCHECK_EQ(fileapi::kFileSystemTypeDrive, url.type());
 
   base::FilePath file_path = util::ExtractDrivePathFromFileSystemUrl(url);
   // Hosted documents don't support stream writer.
   if (file_path.empty() || util::HasHostedDocumentExtension(file_path))
     return scoped_ptr<fileapi::FileStreamWriter>();
 
   return scoped_ptr<fileapi::FileStreamWriter>(
       new internal::WebkitFileStreamWriterImpl(
           base::Bind(&fileapi_internal::GetFileSystemFromUrl, url),
-          context->default_file_task_runner(),file_path, offset));
+          context->default_file_task_runner(),
+          file_path,
+          offset));
+}
+
+fileapi::WatcherManager* FileSystemBackendDelegate::GetWatcherManager(
+    const fileapi::FileSystemURL& url) {
+  NOTIMPLEMENTED();
+  return NULL;
 }
 
 }  // namespace drive