Add specific error codes for when SOCKS connect fails....

net/base/net_error_list.h

 // Copyright (c) 2006-2009 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.
 
 // This file contains the list of network errors.
 
 //
 // Ranges:
 //     0- 99 System related errors
 //   100-199 Connection related errors
@@ skipping 107 matching lines @@
 // The SSL handshake failed because of a bad or missing client certificate.
 NET_ERROR(BAD_SSL_CLIENT_AUTH_CERT, -117)
 
 // A connection attempt timed out.
 NET_ERROR(CONNECTION_TIMED_OUT, -118)
 
 // There are too many pending DNS resolves, so a request in the queue was
 // aborted.
 NET_ERROR(HOST_RESOLVER_QUEUE_TOO_LARGE, -119)
 
+// Failed establishing a connection to the SOCKS proxy server for a target host.
+NET_ERROR(SOCKS_CONNECTION_FAILED, -120)
+
+// The SOCKS proxy server failed establishing connection to the target host
+// because that host is unreachable.
+NET_ERROR(SOCKS_CONNECTION_HOST_UNREACHABLE, -121)
+
 // Certificate error codes
 //
 // The values of certificate error codes must be consecutive.
 
 // The server responded with a certificate whose common name did not match
 // the host name.  This could mean:
 //
 // 1. An attacker has redirected our traffic to his server and is
 //    presenting a certificate for which he knows the private key.
 //
@@ skipping 178 matching lines @@
 NET_ERROR(CACHE_CREATE_FAILURE, -405)
 
 // Multiple transactions are racing to create disk cache entries. This is an
 // internal error returned from the HttpCache to the HttpCacheTransaction that
 // tells the transaction to restart the entry-creation logic because the state
 // of the cache has changed.
 NET_ERROR(CACHE_RACE, -406)
 
 // The server's response was insecure (e.g. there was a cert error).
 NET_ERROR(INSECURE_RESPONSE, -501)