Add a QUIC proxy server to the list of QUIC servers supported at start up

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 65 matching lines @@
   // non-null.
   virtual void GetAlternativeProxy(
       const GURL& url,
       const ProxyServer& resolved_proxy_server,
       ProxyServer* alternative_proxy_server) const = 0;
 
   // Notifies the ProxyDelegate that |alternative_proxy_server| is broken.
   virtual void OnAlternativeProxyBroken(
       const ProxyServer& alternative_proxy_server) = 0;
 
+  // Returns the default alternative proxy server. May return an invalid proxy
+  // server if no valid proxy server is available.
+  virtual ProxyServer GetDefaultAlternativeProxy() const = 0;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(ProxyDelegate);
 };
 
 }
 
 #endif  // NET_BASE_PROXY_DELEGATE_H_