Keep track of network error in ProxyRetryInfo.

net/proxy/proxy_info.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_PROXY_PROXY_INFO_H_
 #define NET_PROXY_PROXY_INFO_H_
 
 #include <string>
 
 #include "base/time/time.h"
@@ skipping 97 matching lines @@
   // Returns the first valid proxy server. is_empty() must be false to be able
   // to call this function.
   const ProxyServer& proxy_server() const { return proxy_list_.Get(); }
 
   // Returns the source for configuration settings used for proxy resolution.
   ProxyConfigSource config_source() const { return config_source_; }
 
   // See description in ProxyList::ToPacString().
   std::string ToPacString() const;
 
-  // Marks the current proxy as bad. Returns true if there is another proxy
+  // Marks the current proxy as bad. |net_error| should contain the network
+  // error encountered when this proxy was tried, if any. If this fallback
+  // is not because of a network error, then |OK| should be passed in (eg. for
+  // reasons such as local policy). Returns true if there is another proxy is
   // available to try in proxy list_.
-  bool Fallback(const BoundNetLog& net_log);
+  bool Fallback(int net_error, const BoundNetLog& net_log);
 
   // De-prioritizes the proxies that we have cached as not working, by moving
   // them to the end of the proxy list.
   void DeprioritizeBadProxies(const ProxyRetryInfoMap& proxy_retry_info);
 
   // Deletes any entry which doesn't have one of the specified proxy schemes.
   void RemoveProxiesWithoutScheme(int scheme_bit_field);
 
   ProxyConfig::ID config_id() const { return config_id_; }
 
@@ skipping 36 matching lines @@
 
   // How long it took to resolve the proxy.  Times are both null if proxy was
   // determined synchronously without running a PAC.
   base::TimeTicks proxy_resolve_start_time_;
   base::TimeTicks proxy_resolve_end_time_;
 };
 
 }  // namespace net
 
 #endif  // NET_PROXY_PROXY_INFO_H_