Store the QUIC server's crypto config expiration time explicitly in the client's CachedState, inste…

net/quic/core/crypto/quic_crypto_client_config.h

Index: net/quic/core/crypto/quic_crypto_client_config.h
diff --git a/net/quic/core/crypto/quic_crypto_client_config.h b/net/quic/core/crypto/quic_crypto_client_config.h
index 9641a5773cebdb7b611975e7463668a015707a3c..4f3f26eb53cacbca96d2a755b6a9d574e5cf9258 100644
--- a/net/quic/core/crypto/quic_crypto_client_config.h
+++ b/net/quic/core/crypto/quic_crypto_client_config.h
@@ -175,6 +175,8 @@ class NET_EXPORT_PRIVATE QuicCryptoClientConfig : public QuicCryptoConfig {
     bool server_config_valid_;          // True if |server_config_| is correctly
                                         // signed and |certs_| has been
                                         // validated.
+    QuicWallTime expiration_time_;      // Time when the config is no longer
+                                        // valid.
     // Generation counter associated with the |server_config_|, |certs_| and
     // |server_config_sig_| combination. It is incremented whenever we set
     // server_config_valid_ to false.