[NaCl SDK] Various fixes so "make debug" works on Windows.

native_client_sdk/src/tools/run.py

 #!/usr/bin/env python
 # 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.
 
 """Launch a local server on an ephemeral port, then launch a executable that
 points to that server.
 """
 
 import copy
@@ skipping 56 matching lines @@
 
   # If any debug args are passed in, assume we want to debug
   if options.debug:
     if getos.GetPlatform() == 'linux':
       cmd = ['xterm', '-title', 'NaCl Debugger', '-e']
       cmd += options.debug
     elif getos.GetPlatform() == 'mac':
       cmd = ['osascript', '-e',
              'tell application "Terminal" to do script "%s"' %
                  ' '.join(r'\"%s\"' % x for x in options.debug)]
-    else:
-      cmd = []
+    elif getos.GetPlatform() == 'win':
+      cmd = ['cmd.exe', '/c', 'start', 'cmd.exe', '/c']
+      cmd += options.debug
     print 'Starting debugger: ' + ' '.join(cmd)
     debug_process = subprocess.Popen(cmd, env=env)
   else:
     debug_process = False
 
   try:
     return server.ServeUntilSubprocessDies(process)
   finally:
     if process.returncode is None:
       process.kill()
     if debug_process and debug_process.returncode is None:
       debug_process.kill()
 
 if __name__ == '__main__':
   sys.exit(main(sys.argv[1:]))