Implement debugger connection on Windows.

runtime/bin/dbg_connection_macos.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_DBG_CONNECTION_MACOS_H_
 #define BIN_DBG_CONNECTION_MACOS_H_
 
 #include <arpa/inet.h>
 #include <netdb.h>
 #include <sys/socket.h>
 
 
 class DebuggerConnectionImpl {
  public:
   static void StartHandler(int port_number);
+  static intptr_t Send(intptr_t socket, const char* buf, int len);
+  static intptr_t Receive(intptr_t socket, char* buf, int len);
 
  private:
   enum MessageType {
     kAddDbgFd = 1,
     kRemoveDbgFd,
     kQuit
   };
 
   struct Message {
     MessageType msg_id;
   };
 
   static void SendMessage(MessageType id);
   static bool ReceiveMessage(Message* msg);
 
   static void SetupPollQueue();
   static void HandleEvent(struct kevent* event);
   static void Handler(uword args);
 
 
 
   // File descriptors for pipes used to communicate with the debugger thread.
   static int wakeup_fds_[2];
   // File descriptor for the polling queue.
   static int kqueue_fd_;
 };
 
 
 #endif  // BIN_DBG_CONNECTION_MACOS_H_