Only mark a proxy as bad if we have confirmation that another proxy succeeded for the same request.

jingle/notifier/base/proxy_resolving_client_socket.h

 // Copyright (c) 2011 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 StreamSocket implementation wraps a ClientSocketHandle that is created
 // from the client socket pool after resolving proxies.
 
 #ifndef JINGLE_NOTIFIER_BASE_PROXY_RESOLVING_CLIENT_SOCKET_H_
 #define JINGLE_NOTIFIER_BASE_PROXY_RESOLVING_CLIENT_SOCKET_H_
 #pragma once
@@ skipping 49 matching lines @@
   virtual base::TimeDelta GetConnectTimeMicros() const OVERRIDE;
 
  private:
   // Proxy resolution and connection functions.
   void ProcessProxyResolveDone(int status);
   void ProcessConnectDone(int status);
 
   void CloseTransportSocket();
   void RunUserConnectCallback(int status);
   int ReconsiderProxyAfterError(int error);
+  void ReportSuccessfulProxyConnection();
 
   // Callbacks passed to net APIs.
   net::CompletionCallbackImpl<ProxyResolvingClientSocket>
       proxy_resolve_callback_;
   net::CompletionCallbackImpl<ProxyResolvingClientSocket> connect_callback_;
 
   scoped_refptr<net::HttpNetworkSession> network_session_;
 
   // The transport socket.
   scoped_ptr<net::ClientSocketHandle> transport_;
 
   const net::SSLConfig ssl_config_;
   net::ProxyService::PacRequest* pac_request_;
   net::ProxyInfo proxy_info_;
   net::HostPortPair dest_host_port_pair_;
   bool tried_direct_connect_fallback_;
   net::BoundNetLog bound_net_log_;
   ScopedRunnableMethodFactory<ProxyResolvingClientSocket>
       scoped_runnable_method_factory_;
 
   // The callback passed to Connect().
   net::CompletionCallback* user_connect_callback_;
 };
 
 }  // namespace notifier
 
 #endif  // JINGLE_NOTIFIER_BASE_PROXY_RESOLVING_CLIENT_SOCKET_H_