Added helper methods to get/set previous_cached_network_params_.

net/quic/quic_crypto_server_stream.h

Index: net/quic/quic_crypto_server_stream.h
diff --git a/net/quic/quic_crypto_server_stream.h b/net/quic/quic_crypto_server_stream.h
index 5d555641ec908f4c7d5e48ab742a01e3b1a2a048..c31a07d67101840120316a30d065a450edc7df3b 100644
--- a/net/quic/quic_crypto_server_stream.h
+++ b/net/quic/quic_crypto_server_stream.h
@@ -84,6 +84,9 @@ class NET_EXPORT_PRIVATE QuicCryptoServerStream : public QuicCryptoStream {
   // client.
   void OnServerHelloAcked();
 
+  void set_previous_cached_network_params(
+      CachedNetworkParameters cached_network_params);
+
  protected:
   virtual QuicErrorCode ProcessClientHello(
       const CryptoHandshakeMessage& message,
@@ -95,6 +98,8 @@ class NET_EXPORT_PRIVATE QuicCryptoServerStream : public QuicCryptoStream {
   // before going through the parameter negotiation step.
   virtual void OverrideQuicConfigDefaults(QuicConfig* config);
 
+  CachedNetworkParameters* get_previous_cached_network_params();
+
  private:
   friend class test::CryptoTestUtils;