Add a dedicated SSL protocol version metric.

net/socket/ssl_client_socket.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.h"
 
 #include "base/metrics/histogram.h"
 #include "base/metrics/sparse_histogram.h"
 #include "base/strings/string_util.h"
 #include "crypto/ec_private_key.h"
@@ skipping 158 matching lines @@
     else if (!channel_id_service->IsSystemTimeValid())
       supported = CLIENT_BAD_SYSTEM_TIME;
     else
       supported = CLIENT_ONLY;
   }
   UMA_HISTOGRAM_ENUMERATION("DomainBoundCerts.Support", supported,
                             CHANNEL_ID_USAGE_MAX);
 }
 
 // static
-void SSLClientSocket::RecordConnectionTypeMetrics(int ssl_version) {
-  UpdateConnectionTypeHistograms(CONNECTION_SSL);
-  switch (ssl_version) {
-    case SSL_CONNECTION_VERSION_SSL2:
-      UpdateConnectionTypeHistograms(CONNECTION_SSL_SSL2);
-      break;
-    case SSL_CONNECTION_VERSION_SSL3:
-      UpdateConnectionTypeHistograms(CONNECTION_SSL_SSL3);
-      break;
-    case SSL_CONNECTION_VERSION_TLS1:
-      UpdateConnectionTypeHistograms(CONNECTION_SSL_TLS1);
-      break;
-    case SSL_CONNECTION_VERSION_TLS1_1:
-      UpdateConnectionTypeHistograms(CONNECTION_SSL_TLS1_1);
-      break;
-    case SSL_CONNECTION_VERSION_TLS1_2:
-      UpdateConnectionTypeHistograms(CONNECTION_SSL_TLS1_2);
-      break;
-  }
-}
-
-// static
 bool SSLClientSocket::IsChannelIDEnabled(
     const SSLConfig& ssl_config,
     ChannelIDService* channel_id_service) {
   if (!ssl_config.channel_id_enabled)
     return false;
   if (!channel_id_service) {
     DVLOG(1) << "NULL channel_id_service_, not enabling channel ID.";
     return false;
   }
   if (!crypto::ECPrivateKey::IsSupported()) {
@@ skipping 72 matching lines @@
     } else {
       sample += 500;
     }
   } else {
     DCHECK_EQ(kExtensionALPN, negotiation_extension_);
   }
   UMA_HISTOGRAM_SPARSE_SLOWLY("Net.SSLProtocolNegotiation", sample);
 }
 
 }  // namespace net