Join embeder threads on Windows.

runtime/bin/dbg_connection_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_DBG_CONNECTION_WIN_H_
 #define BIN_DBG_CONNECTION_WIN_H_
 
+#include "bin/lockers.h"
+#include "bin/thread.h"
+
 namespace dart {
 namespace bin {
 
 class DebuggerConnectionImpl {
  public:
   static void StartHandler(int port_number);
+  static void StopHandler(intptr_t debug_fd);
   static intptr_t Send(intptr_t socket, const char* buf, int len);
   static intptr_t Receive(intptr_t socket, char* buf, int len);
 
  private:
   static void ThreadEntry(uword args);
+  static void NotifyThreadStarted();
+  static void WaitForThreadStarted();
+  static void NotifyThreadFinished();
+  static void WaitForThreadFinished();
+
+  static Monitor* handler_monitor_;
+  static ThreadId handler_thread_id_;
+  static bool handler_thread_running_;
 };
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // BIN_DBG_CONNECTION_WIN_H_