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

net/base/proxy_delegate.h

Index: net/base/proxy_delegate.h
diff --git a/net/base/proxy_delegate.h b/net/base/proxy_delegate.h
index fd50b20b6d015dc8d6056d6bc7813e8d0af50ad7..36d17a836b5f7d3123c761ae2fbb1f9f907bca3b 100644
--- a/net/base/proxy_delegate.h
+++ b/net/base/proxy_delegate.h
@@ -83,6 +83,10 @@ class NET_EXPORT ProxyDelegate {
   virtual void OnAlternativeProxyBroken(
       const ProxyServer& alternative_proxy_server) = 0;
 
+  // Returns the QUIC proxy server that is expected to be used in the
+  // recent future.
+  virtual ProxyServer GetQuicSupportedProxyServerAtStartUp() const = 0;
+
  private:
   DISALLOW_COPY_AND_ASSIGN(ProxyDelegate);
 };