Race TCP connection to proxies with QUIC connections

net/base/proxy_delegate.h

 // Copyright 2014 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_BASE_PROXY_DELEGATE_H_
 #define NET_BASE_PROXY_DELEGATE_H_
 
 #include <string>
 
 #include "base/macros.h"
@@ skipping 50 matching lines @@
   // Called after the response headers for the tunnel request are received.
   virtual void OnTunnelHeadersReceived(
       const HostPortPair& origin,
       const HostPortPair& proxy_server,
       const HttpResponseHeaders& response_headers) = 0;
 
   // Returns true if |proxy_server| is a trusted SPDY/HTTP2 proxy that is
   // allowed to push cross-origin resources.
   virtual bool IsTrustedSpdyProxy(const net::ProxyServer& proxy_server) = 0;
 
+  // GetAlternativeProxy is called after the proxy is resolved but before the

[RyanSturm, 2016/08/19 19:03:23]

s/GetAlternativeProxy is called/Called

[tbansal1, 2016/08/20 01:53:39]

Done.

+  // connection is established. |resolved_proxy_server| is the proxy server
+  // resolved by the proxy service for fetching |url|. GetAlternativeProxy

[RyanSturm, 2016/08/19 19:03:23]

s/GetAlternativeProxy should set/ Sets

[tbansal1, 2016/08/20 01:53:39]

Done.

+  // should set |alternative_proxy_server| to an alternative proxy server, if
+  // one is available to fetch |url|. |alternative_proxy_server| is owned by
+  // the caller, and is guaranteed to be non-null.
+  virtual void GetAlternativeProxy(
+      const GURL& url,
+      const ProxyServer& resolved_proxy_server,
+      ProxyServer* alternative_proxy_server) const {}
+
+  // Notifies the ProxyDelegate that |alternative_proxy_server| is broken.
+  virtual void OnAlternativeProxyBroken(
+      const ProxyServer& alternative_proxy_server) {}
+
  private:
   DISALLOW_COPY_AND_ASSIGN(ProxyDelegate);
 };
 
 }
 
 #endif  // NET_BASE_PROXY_DELEGATE_H_