Merge 159454 - Flush at the end of local file writing in FileWriter API.

webkit/fileapi/sandbox_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/fileapi/sandbox_file_stream_writer.h"
 
 #include "base/file_util_proxy.h"
 #include "base/platform_file.h"
 #include "base/sequenced_task_runner.h"
 #include "net/base/io_buffer.h"
@@ skipping 216 matching lines @@
   if (cancel_callback_.is_null())
     return false;
 
   net::CompletionCallback pending_cancel = cancel_callback_;
   has_pending_operation_ = false;
   cancel_callback_.Reset();
   pending_cancel.Run(net::OK);
   return true;
 }
 
+int SandboxFileStreamWriter::Flush(const net::CompletionCallback& callback) {
+  // For now, Flush is meaningful only for local native file access. It is no-op
+  // for sandboxed filesystem files (see the discussion in crbug.com/144790).
+  return net::OK;
+}
+
 }  // namespace fileapi