Keep track of network error in ProxyRetryInfo.

net/proxy/proxy_retry_info.h

 // Copyright (c) 2006-2008 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_PROXY_PROXY_RETRY_INFO_H_
 #define NET_PROXY_PROXY_RETRY_INFO_H_
 
 #include <map>
 
 #include "base/time/time.h"
 
 namespace net {
 
 // Contains the information about when to retry a proxy server.
 struct ProxyRetryInfo {
   ProxyRetryInfo() : try_while_bad(true) {}
 
   // We should not retry until this time.
   base::TimeTicks bad_until;
 
   // This is the current delay. If the proxy is still bad, we need to increase
   // this delay.
   base::TimeDelta current_delay;
 
   // True if this proxy should be considered even if still bad.
   bool try_while_bad;
+
+  // The network error we received when we tried to use this proxy.
+  int net_error;
 };
 
 // Map of proxy servers with the associated RetryInfo structures.
 // The key is a proxy URI string [<scheme>"://"]<host>":"<port>.
 typedef std::map<std::string, ProxyRetryInfo> ProxyRetryInfoMap;
 
 }  // namespace net
 
 #endif  // NET_PROXY_PROXY_RETRY_INFO_H_