Add error_details when the QuicCryptoServerConfig fails to get crypto proof.

net/quic/core/crypto/quic_crypto_server_config.cc

 // Copyright 2013 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.
 
 #include "net/quic/core/crypto/quic_crypto_server_config.h"
 
 #include <stdlib.h>
 
 #include <algorithm>
 #include <memory>
@@ skipping 746 matching lines @@
                               primary_config->serialized, version, chlo_hash,
                               std::move(cb));
       helper.DetachCallback();
       return;
     }
 
     if (!proof_source_->GetProof(server_ip, info.sni.as_string(),
                                  primary_config->serialized, version, chlo_hash,
                                  &crypto_proof->chain, &crypto_proof->signature,
                                  &crypto_proof->cert_sct)) {
-      helper.Fail(QUIC_HANDSHAKE_FAILED, "");
+      helper.Fail(QUIC_HANDSHAKE_FAILED, "Missing or invalid crypto proof.");
       return;
     }
   }
 
   helper.DetachCallback();
   ProcessClientHelloAfterGetProof(
       /* found_error = */ false, *validate_chlo_result, reject_only,
       connection_id, client_address, version, supported_versions,
       use_stateless_rejects, server_designated_connection_id, clock, rand,
       compressed_certs_cache, params, crypto_proof, total_framing_overhead,
@@ skipping 1466 matching lines @@
       expiry_time(QuicWallTime::Zero()),
       priority(0),
       source_address_token_boxer(nullptr) {}
 
 QuicCryptoServerConfig::Config::~Config() {
 }
 
 QuicCryptoProof::QuicCryptoProof() {}
 QuicCryptoProof::~QuicCryptoProof() {}
 }  // namespace net