Add a histogram for session resumption version mismatches.

net/socket/ssl_client_socket_openssl.cc

Index: net/socket/ssl_client_socket_openssl.cc
diff --git a/net/socket/ssl_client_socket_openssl.cc b/net/socket/ssl_client_socket_openssl.cc
index 4e86c055932ed7517600625db0179d13ee720029..b5a9472d8009522e2281e6c56eb1239a86ff7fac 100644
--- a/net/socket/ssl_client_socket_openssl.cc
+++ b/net/socket/ssl_client_socket_openssl.cc
@@ -1131,9 +1131,18 @@ int SSLClientSocketOpenSSL::DoVerifyCertComplete(int result) {
     }
   }
 
-  if (result == OK)
+  if (result == OK) {
     RecordConnectionTypeMetrics(GetNetSSLVersion(ssl_));
 
+    if (SSL_session_reused(ssl_)) {
+      // Record whether or not the server tried to resume a session for a
+      // different version. See https://crbug.com/441456.
+      UMA_HISTOGRAM_BOOLEAN(
+          "Net.SSLSessionVersionMatch",
+          SSL_version(ssl_) == SSL_get_session(ssl_)->ssl_version);
+    }
+  }
+
   const CertStatus cert_status = server_cert_verify_result_.cert_status;
   if (transport_security_state_ &&
       (result == OK ||