Add histogram to track NPN/ALPN.

net/socket/ssl_client_socket_openssl.cc

 // Copyright (c) 2012 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.
 
 // OpenSSL binding for SSLClientSocket. The class layout and general principle
 // of operation is derived from SSLClientSocketNSS.
 
 #include "net/socket/ssl_client_socket_openssl.h"
 
 #include <errno.h>
@@ skipping 924 matching lines @@
     }
 
     // SSL handshake is completed. If NPN wasn't negotiated, see if ALPN was.
     if (npn_status_ == kNextProtoUnsupported) {
       const uint8_t* alpn_proto = NULL;
       unsigned alpn_len = 0;
       SSL_get0_alpn_selected(ssl_, &alpn_proto, &alpn_len);
       if (alpn_len > 0) {
         npn_proto_.assign(reinterpret_cast<const char*>(alpn_proto), alpn_len);
         npn_status_ = kNextProtoNegotiated;
+        set_protocol_negotiation(PN_ALPN);
       }
     }
 
     RecordChannelIDSupport(channel_id_service_,
                            channel_id_xtn_negotiated_,
                            ssl_config_.channel_id_enabled,
                            crypto::ECPrivateKey::IsSupported());
 
     uint8_t* ocsp_response;
     size_t ocsp_response_len;
@@ skipping 716 matching lines @@
 
   // If we didn't find a protocol, we select the first one from our list.
   if (npn_status_ == kNextProtoNoOverlap) {
     *out = reinterpret_cast<uint8*>(const_cast<char*>(
         ssl_config_.next_protos[0].data()));
     *outlen = ssl_config_.next_protos[0].size();
   }
 
   npn_proto_.assign(reinterpret_cast<const char*>(*out), *outlen);
   DVLOG(2) << "next protocol: '" << npn_proto_ << "' status: " << npn_status_;
+  set_protocol_negotiation(PN_NPN);
   return SSL_TLSEXT_ERR_OK;
 }
 
 long SSLClientSocketOpenSSL::MaybeReplayTransportError(
     BIO *bio,
     int cmd,
     const char *argp, int argi, long argl,
     long retvalue) {
   if (cmd == (BIO_CB_READ|BIO_CB_RETURN) && retvalue <= 0) {
     // If there is no more data in the buffer, report any pending errors that
@@ skipping 82 matching lines @@
                                             ct::SCT_STATUS_LOG_UNKNOWN));
   }
 }
 
 scoped_refptr<X509Certificate>
 SSLClientSocketOpenSSL::GetUnverifiedServerCertificateChain() const {
   return server_cert_;
 }
 
 }  // namespace net