SSLClientSessionCache: Log number of times Lookup is called per Session.

net/socket/ssl_client_socket_impl.h

 // 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.
 
 #ifndef NET_SOCKET_SSL_CLIENT_SOCKET_IMPL_H_
 #define NET_SOCKET_SSL_CLIENT_SOCKET_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 297 matching lines @@
   bssl::UniquePtr<SSL> ssl_;
 
   std::unique_ptr<ClientSocketHandle> transport_;
   std::unique_ptr<SocketBIOAdapter> transport_adapter_;
   const HostPortPair host_and_port_;
   SSLConfig ssl_config_;
   // ssl_session_cache_shard_ is an opaque string that partitions the SSL
   // session cache. i.e. sessions created with one value will not attempt to
   // resume on the socket with a different value.
   const std::string ssl_session_cache_shard_;
+  size_t ssl_session_cache_lookup_count_;
 
   enum State {
     STATE_NONE,
     STATE_HANDSHAKE,
     STATE_HANDSHAKE_COMPLETE,
     STATE_CHANNEL_ID_LOOKUP,
     STATE_CHANNEL_ID_LOOKUP_COMPLETE,
     STATE_VERIFY_CERT,
     STATE_VERIFY_CERT_COMPLETE,
   };
@@ skipping 32 matching lines @@
   // True if PKP is bypassed due to a local trust anchor.
   bool pkp_bypassed_;
 
   NetLogWithSource net_log_;
   base::WeakPtrFactory<SSLClientSocketImpl> weak_factory_;
 };
 
 }  // namespace net
 
 #endif  // NET_SOCKET_SSL_CLIENT_SOCKET_IMPL_H_