Add histogram to track NPN/ALPN.

net/socket/ssl_client_socket_pool.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.
 
 #include "net/socket/ssl_client_socket_pool.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/metrics/field_trial.h"
 #include "base/metrics/histogram.h"
@@ skipping 434 matching lines @@
 
 int SSLConnectJob::DoSSLConnectComplete(int result) {
   connect_timing_.ssl_end = base::TimeTicks::Now();
 
   SSLClientSocket::NextProtoStatus status =
       SSLClientSocket::kNextProtoUnsupported;
   std::string proto;
   // GetNextProto will fail and and trigger a NOTREACHED if we pass in a socket
   // that hasn't had SSL_ImportFD called on it. If we get a certificate error
   // here, then we know that we called SSL_ImportFD.
-  if (result == OK || IsCertificateError(result))
+  if (result == OK || IsCertificateError(result)) {
     status = ssl_socket_->GetNextProto(&proto);
+    ssl_socket_->RecordNegotiationExtension();
+  }
 
   // If we want spdy over npn, make sure it succeeded.
   if (status == SSLClientSocket::kNextProtoNegotiated) {
     ssl_socket_->set_was_npn_negotiated(true);
     NextProto protocol_negotiated =
         SSLClientSocket::NextProtoFromString(proto);
     ssl_socket_->set_protocol_negotiated(protocol_negotiated);
     // If we negotiated a SPDY version, it must have been present in
     // SSLConfig::next_protos.
     // TODO(mbelshe): Verify this.
@@ skipping 375 matching lines @@
   CHECK(it != messenger_map_.end());
   delete it->second;
   messenger_map_.erase(it);
 }
 
 void SSLClientSocketPool::OnSSLConfigChanged() {
   FlushWithError(ERR_NETWORK_CHANGED);
 }
 
 }  // namespace net