Return errors from the Mojo network service using an enum.

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 {
 
@@ skipping 91 matching lines @@
       pending_buffer_(pending_buffer) {
 }
 
 MojoToNetIOBuffer::~MojoToNetIOBuffer() {
 }
 
 // -----------------------------------------------------------------------------
 
 NetworkErrorPtr MakeNetworkError(int error_code) {
   NetworkErrorPtr error = NetworkError::New();
-  error->code = error_code;
+  error->code = static_cast<NetworkCode>(error_code);

[jamesr, 2015/02/18 18:43:06]

can you add a set of static_assert<>s that the enum values in mojo match the
ones in net/error/... ? that way if the error codes get out of sync there will
be a compile-time error instead of a mismatched enum value

[ppi, 2015/02/19 14:22:18]

Neat! Done.

   if (error_code <= 0)
     error->description = net::ErrorToString(error_code);
   return error.Pass();
 }
 
 }  // namespace mojo