Add CHECK() in UdpSocketLibevent to debug crbug.com/452121

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/basictypes.h"
 #include "base/callback.h"
@@ skipping 278 matching lines @@
     return MapSystemError(WSAGetLastError());
   if (!use_non_blocking_io_) {
     core_ = new Core(this);
   } else {
     read_write_event_.Set(WSACreateEvent());
     WSAEventSelect(socket_, read_write_event_.Get(), FD_READ | FD_WRITE);
   }
   return OK;
 }
 
-void UDPSocketWin::Close() {
+int UDPSocketWin::Close() {
   DCHECK(CalledOnValidThread());
 
   if (socket_ == INVALID_SOCKET)
-    return;
+    return OK;
 
   if (qos_handle_) {
     QwaveAPI::Get().CloseHandle(qos_handle_);
   }
 
   // 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_);
+  int result = MapSystemError(closesocket(socket_));
   UMA_HISTOGRAM_TIMES("Net.UDPSocketWinClose",
                       base::TimeTicks::Now() - start_time);
   socket_ = INVALID_SOCKET;
   addr_family_ = 0;
   is_connected_ = false;
 
   read_write_watcher_.StopWatching();
   read_write_event_.Close();
 
   if (core_) {
     core_->Detach();
     core_ = NULL;
   }
+
+  return result;
 }
 
 int UDPSocketWin::GetPeerAddress(IPEndPoint* address) const {
   DCHECK(CalledOnValidThread());
   DCHECK(address);
   if (!is_connected())
     return ERR_SOCKET_NOT_CONNECTED;
 
   // TODO(szym): Simplify. http://crbug.com/126152
   if (!remote_address_.get()) {
@@ skipping 834 matching lines @@
 void UDPSocketWin::DetachFromThread() {
   base::NonThreadSafe::DetachFromThread();
 }
 
 void UDPSocketWin::UseNonBlockingIO() {
   DCHECK(!core_);
   use_non_blocking_io_ = true;
 }
 
 }  // namespace net