Add a new histogram Net.QuicSession.HandshakeConfirmedTime which tracks

net/quic/quic_client_session.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/quic/quic_client_session.h"
 
 #include "base/callback_helpers.h"
 #include "base/message_loop/message_loop.h"
 #include "base/metrics/histogram.h"
 #include "base/metrics/sparse_histogram.h"
@@ skipping 417 matching lines @@
   ssl_info->client_cert_sent = false;
   ssl_info->channel_id_sent = false;
   ssl_info->security_bits = security_bits;
   ssl_info->handshake_type = SSLInfo::HANDSHAKE_FULL;
   return true;
 }
 
 int QuicClientSession::CryptoConnect(bool require_confirmation,
                                      const CompletionCallback& callback) {
   require_confirmation_ = require_confirmation;
+  handshake_start_ = base::TimeTicks::Now();
   RecordHandshakeState(STATE_STARTED);
   if (!crypto_stream_->CryptoConnect()) {
     // TODO(wtc): change crypto_stream_.CryptoConnect() to return a
     // QuicErrorCode and map it to a net error code.
     return ERR_CONNECTION_FAILED;
   }
 
   if (IsCryptoHandshakeConfirmed())
     return OK;
 
@@ skipping 89 matching lines @@
 void QuicClientSession::OnCryptoHandshakeEvent(CryptoHandshakeEvent event) {
   if (!callback_.is_null() &&
       (!require_confirmation_ || event == HANDSHAKE_CONFIRMED)) {
     // TODO(rtenneti): Currently for all CryptoHandshakeEvent events, callback_
     // could be called because there are no error events in CryptoHandshakeEvent
     // enum. If error events are added to CryptoHandshakeEvent, then the
     // following code needs to changed.
     base::ResetAndReturn(&callback_).Run(OK);
   }
   if (event == HANDSHAKE_CONFIRMED) {
+    UMA_HISTOGRAM_TIMES("Net.QuicSession.HandshakeConfirmedTime",
+                        base::TimeTicks::Now() - handshake_start_);
     ObserverSet::iterator it = observers_.begin();
     while (it != observers_.end()) {
       Observer* observer = *it;
       ++it;
       observer->OnCryptoHandshakeConfirmed();
     }
   }
   QuicSession::OnCryptoHandshakeEvent(event);
 }
 
@@ skipping 278 matching lines @@
 
   if (IsCryptoHandshakeConfirmed())
     return;
 
   if (stream_factory_)
     stream_factory_->OnSessionConnectTimeout(this);
   CloseAllStreams(ERR_QUIC_HANDSHAKE_FAILED);
 }
 
 }  // namespace net