Flush at the end of local file writing in FileWriter API.

webkit/chromeos/fileapi/remote_file_stream_writer.cc

 // Copyright (c) 2012 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 "webkit/chromeos/fileapi/remote_file_stream_writer.h"
 
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 #include "webkit/blob/local_file_stream_reader.h"
 #include "webkit/blob/shareable_file_reference.h"
@@ skipping 86 matching lines @@
     pending_cancel_callback_ = callback;
     return local_file_writer_->Cancel(
         base::Bind(&RemoteFileStreamWriter::InvokePendingCancelCallback,
                    weak_factory_.GetWeakPtr()));
   }
 
   // Write() is not called yet.
   return net::ERR_UNEXPECTED;
 }
 
+int RemoteFileStreamWriter::Flush(const net::CompletionCallback& callback) {
+  // For remote file writer, Flush() is a no-op. Synchronization to the remote
+  // server is not done until the file is closed.
+  return net::OK;
+}
+
 void RemoteFileStreamWriter::InvokePendingCancelCallback(int result) {
   net::CompletionCallback callback = pending_cancel_callback_;
   pending_cancel_callback_.Reset();
   callback.Run(result);
 }
 
 }  // namespace gdata