Implement parts of the Mojo TCP interfaces.

mojo/services/network/net_adapters.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 "mojo/services/network/net_adapters.h"
+
+#include "net/base/net_errors.h"
+
+namespace mojo {
+
+NetworkErrorPtr MakeNetworkError(int error_code) {
+  NetworkErrorPtr error = NetworkError::New();
+  error->code = error_code;
+  error->description = net::ErrorToString(error_code);

[yzshen1, 2014/10/07 20:14:34]

Maybe we should handle the error_code > 0 case (say, by not setting
description). IIRC, it will set "unknown" or something like that.

+  return error.Pass();
+}
+
+}  // namespace mojo