Test tools for udp proxying. This involves a few refactors of test

net/tools/quic/quic_server.h

Index: net/tools/quic/quic_server.h
diff --git a/net/tools/quic/quic_server.h b/net/tools/quic/quic_server.h
index 3bba860a0eda44f2cfdb9e1a525a00fe42ef748c..6285fd769d953417076055dcdf0d1e35247cf71b 100644
--- a/net/tools/quic/quic_server.h
+++ b/net/tools/quic/quic_server.h
@@ -80,6 +80,18 @@ class QuicServer : public EpollCallbackInterface {
 
   int port() { return port_; }
 
+ protected:
+  virtual QuicDispatcher* CreateQuicDispatcher();
+
+  const QuicConfig& config() const { return config_; }
+  const QuicCryptoServerConfig& crypto_config() const {
+    return crypto_config_;
+  }
+  const QuicVersionVector& supported_versions() const {
+    return supported_versions_;
+  }
+  EpollServer* epoll_server() { return &epoll_server_; }
+
  private:
   friend class net::tools::test::QuicServerPeer;