Added WriteResult::WriteResult method for internal use.

net/quic/quic_protocol.h

 // 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.
 
 #ifndef NET_QUIC_QUIC_PROTOCOL_H_
 #define NET_QUIC_QUIC_PROTOCOL_H_
 
 #include <stddef.h>
 #include <limits>
 #include <map>
@@ skipping 998 matching lines @@
 enum WriteStatus {
   WRITE_STATUS_OK,
   WRITE_STATUS_BLOCKED,
   WRITE_STATUS_ERROR,
 };
 
 // A struct used to return the result of write calls including either the number
 // of bytes written or the error code, depending upon the status.
 struct NET_EXPORT_PRIVATE WriteResult {
   WriteResult(WriteStatus status, int bytes_written_or_error_code);
+  WriteResult();
 
   WriteStatus status;
   union {
     int bytes_written;  // only valid when status is OK
     int error_code;  // only valid when status is ERROR
   };
 };
 
 }  // namespace net
 
 #endif  // NET_QUIC_QUIC_PROTOCOL_H_