Add support of serving SCT on the server side in QUIC, gated by QUIC_VERSION_30.

net/quic/crypto/crypto_handshake.cc

 // Copyright (c) 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/crypto/crypto_handshake.h"
 
 #include "net/quic/crypto/common_cert_set.h"
 #include "net/quic/crypto/key_exchange.h"
 #include "net/quic/crypto/quic_decrypter.h"
 #include "net/quic/crypto/quic_encrypter.h"
 
 namespace net {
 
 QuicCryptoNegotiatedParameters::QuicCryptoNegotiatedParameters()
     : key_exchange(0),
       aead(0),
       x509_ecdsa_supported(false),
-      x509_supported(false) {}
+      x509_supported(false),
+      sct_supported_by_client(false) {}
 
 QuicCryptoNegotiatedParameters::~QuicCryptoNegotiatedParameters() {}
 
 QuicCryptoProof::QuicCryptoProof() : certs(nullptr) {}
 QuicCryptoProof::~QuicCryptoProof() {}
 
 CrypterPair::CrypterPair() {}
 
 CrypterPair::~CrypterPair() {}
 
 // static
 const char QuicCryptoConfig::kInitialLabel[] = "QUIC key expansion";
 
 // static
 const char QuicCryptoConfig::kCETVLabel[] = "QUIC CETV block";
 
 // static
 const char QuicCryptoConfig::kForwardSecureLabel[] =
     "QUIC forward secure key expansion";
 
 QuicCryptoConfig::QuicCryptoConfig()
     : common_cert_sets(CommonCertSets::GetInstanceQUIC()) {
 }
 
 QuicCryptoConfig::~QuicCryptoConfig() {}
 
 }  // namespace net