Add histograms to track localStorage size and load time by size.

net/socket/tcp_client_socket_libevent.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_TCP_CLIENT_SOCKET_LIBEVENT_H_
 #define NET_SOCKET_TCP_CLIENT_SOCKET_LIBEVENT_H_
 
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
@@ skipping 173 matching lines @@
   BoundNetLog net_log_;
 
   // This socket was previously disconnected and has not been re-connected.
   bool previously_disconnected_;
 
   // Record of connectivity and transmissions, for use in speculative connection
   // histograms.
   UseHistory use_history_;
 
   // Enables experimental TCP FastOpen option.
-  bool use_tcp_fastopen_;
+  const bool use_tcp_fastopen_;
 
   // True when TCP FastOpen is in use and we have done the connect.
   bool tcp_fastopen_connected_;
 
   base::TimeTicks connect_start_time_;
   base::TimeDelta connect_time_micros_;
   int64 num_bytes_read_;
 
   DISALLOW_COPY_AND_ASSIGN(TCPClientSocketLibevent);
 };
 
 }  // namespace net
 
 #endif  // NET_SOCKET_TCP_CLIENT_SOCKET_LIBEVENT_H_