Fix socket error reporting on Windows

runtime/bin/eventhandler_win.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef BIN_EVENTHANDLER_WIN_H_
 #define BIN_EVENTHANDLER_WIN_H_
 
 #if !defined(BIN_EVENTHANDLER_H_)
 #error Do not include eventhandler_win.h directly; use eventhandler.h instead.
 #endif
@@ skipping 199 matching lines @@
     kCloseRead = 1,
     kCloseWrite = 2,
     kDoesNotSupportOverlappedIO = 3,
     kError = 4
   };
 
   explicit Handle(HANDLE handle);
   Handle(HANDLE handle, Dart_Port port);
 
   virtual void AfterClose() = 0;
+  virtual void HandleIssueError();
 
   Type type_;
   HANDLE handle_;
   Dart_Port port_;  // Dart port to communicate events for this socket.
   intptr_t mask_;  // Mask of events to report through the port.
   HANDLE completion_port_;
   EventHandlerImplementation* event_handler_;
 
   IOBuffer* data_ready_;  // IO buffer for data ready to be read.
   IOBuffer* pending_read_;  // IO buffer for pending read.
@@ skipping 23 matching lines @@
 
 
 class SocketHandle : public Handle {
  public:
   SOCKET socket() { return reinterpret_cast<SOCKET>(handle_); }
 
  protected:
   explicit SocketHandle(SOCKET s) : Handle(reinterpret_cast<HANDLE>(s)) {}
   SocketHandle(SOCKET s, Dart_Port port)
       : Handle(reinterpret_cast<HANDLE>(s), port) {}
+
+  virtual void HandleIssueError();
 };
 
 
 // Information on listen sockets.
 class ListenSocket : public SocketHandle {
  public:
   explicit ListenSocket(SOCKET s) : SocketHandle(s),
                                     AcceptEx_(NULL),
                                     pending_accept_count_(0),
                                     accepted_head_(NULL),
@@ skipping 100 matching lines @@
   ClientSocket* client_sockets_head_;
 
   int64_t timeout_;  // Time for next timeout.
   Dart_Port timeout_port_;
   bool shutdown_;
   HANDLE completion_port_;
 };
 
 
 #endif  // BIN_EVENTHANDLER_WIN_H_