Keep track of network error in ProxyRetryInfo.

net/proxy/proxy_service.h

Index: net/proxy/proxy_service.h
diff --git a/net/proxy/proxy_service.h b/net/proxy/proxy_service.h
index 7b3e5d26491e387242075b0fa478e44a28169760..4d8d9928e6876068c2a4f9b8ec963740bff3813b 100644
--- a/net/proxy/proxy_service.h
+++ b/net/proxy/proxy_service.h
@@ -168,8 +168,10 @@ class NET_EXPORT ProxyService : public NetworkChangeNotifier::IPAddressObserver,
 
   // Called to report that the last proxy connection succeeded.  If |proxy_info|
   // has a non empty proxy_retry_info map, the proxies that have been tried (and
-  // failed) for this request will be marked as bad.
-  void ReportSuccess(const ProxyInfo& proxy_info);
+  // failed) for this request will be marked as bad. |network_delegate| will
+  // be notified of any proxy fallbacks.
+  void ReportSuccess(const ProxyInfo& proxy_info,
+                     NetworkDelegate* network_delegate);
 
   // Call this method with a non-null |pac_request| to cancel the PAC request.
   void CancelPacRequest(PacRequest* pac_request);