[net/udp] Measure the time spent in closesocket on Windows.

net/udp/udp_socket_win.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/udp/udp_socket_win.h"
 
 #include <mstcpip.h>
 
 #include "base/callback.h"
 #include "base/logging.h"
 #include "base/message_loop.h"
+#include "base/metrics/histogram.h"
 #include "base/metrics/stats_counters.h"
 #include "base/posix/eintr_wrapper.h"
 #include "base/rand_util.h"
 #include "net/base/io_buffer.h"
 #include "net/base/ip_endpoint.h"
 #include "net/base/net_errors.h"
 #include "net/base/net_log.h"
 #include "net/base/net_util.h"
 #include "net/base/winsock_init.h"
 #include "net/base/winsock_util.h"
@@ skipping 161 matching lines @@
   DCHECK(CalledOnValidThread());
 
   if (!is_connected())
     return;
 
   // Zero out any pending read/write callback state.
   read_callback_.Reset();
   recv_from_address_ = NULL;
   write_callback_.Reset();
 
+  base::TimeTicks start_time = base::TimeTicks::Now();
   closesocket(socket_);
+  UMA_HISTOGRAM_TIMES("Net.UDPSocketWinClose",
+                      base::TimeTicks::Now() - start_time);
   socket_ = INVALID_SOCKET;
 
   core_->Detach();
   core_ = NULL;
 }
 
 int UDPSocketWin::GetPeerAddress(IPEndPoint* address) const {
   DCHECK(CalledOnValidThread());
   DCHECK(address);
   if (!is_connected())
@@ skipping 398 matching lines @@
   }
   return DoBind(IPEndPoint(ip, 0));
 }
 
 bool UDPSocketWin::ReceiveAddressToIPEndpoint(IPEndPoint* address) const {
   SockaddrStorage& storage = core_->recv_addr_storage_;
   return address->FromSockAddr(storage.addr, storage.addr_len);
 }
 
 }  // namespace net