Add code count for Trust Anchor IDs to quic::TlsServerConnection::AddCertChain()

PiperOrigin-RevId: 863386061

quiche/quic/core/crypto/tls_server_connection.cc

diff --git a/quiche/quic/core/crypto/tls_server_connection.cc b/quiche/quic/core/crypto/tls_server_connection.cc
index d6dc35f..4771097 100644
--- a/quiche/quic/core/crypto/tls_server_connection.cc
+++ b/quiche/quic/core/crypto/tls_server_connection.cc
@@ -87,11 +87,14 @@
   SSL_CREDENTIAL_set_private_key_method(
       credential.get(), &TlsServerConnection::kPrivateKeyMethod);
   if (!trust_anchor_id.empty()) {
+    QUIC_CODE_COUNT(quic_tls_server_connection_trust_anchor_id_present);
     SSL_CREDENTIAL_set1_trust_anchor_id(
         credential.get(),
         reinterpret_cast<const uint8_t*>(trust_anchor_id.data()),
         trust_anchor_id.size());
     SSL_CREDENTIAL_set_must_match_issuer(credential.get(), 1);
+  } else {
+    QUIC_CODE_COUNT(quic_tls_server_connection_trust_anchor_id_empty);
   }
   SSL_add1_credential(ssl(), credential.get());
 }

quiche/quic/core/tls_server_handshaker.cc

diff --git a/quiche/quic/core/tls_server_handshaker.cc b/quiche/quic/core/tls_server_handshaker.cc
index 59d1c1e..1024b2f 100644
--- a/quiche/quic/core/tls_server_handshaker.cc
+++ b/quiche/quic/core/tls_server_handshaker.cc
@@ -1175,8 +1175,11 @@
                  ProofSource::Chain> absl_nonnull& chain :
              local_config->chains) {
           if (!chain->certs.empty()) {
+            QUIC_CODE_COUNT(quic_tls_server_chain_with_certs_nonempty);
             tls_connection_.AddCertChain(chain->ToCryptoBuffers().value,
                                          chain->trust_anchor_id);
+          } else {
+            QUIC_CODE_COUNT(quic_tls_server_chain_with_certs_empty);
           }
         }
         select_cert_status_ = QUIC_SUCCESS;