ninja win: Add support for 'CallingConvention'

test/win/gyptest-cl-calling-convention.py

 #!/usr/bin/env python
 
 # Copyright (c) 2014 Google Inc. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """
-Test that .idl files in actions and non-native rules are excluded.
+Make sure calling convention setting is extracted properly.
 """
 
 import TestGyp
 
 import sys
 
 if sys.platform == 'win32':
   test = TestGyp.TestGyp(formats=['msvs', 'ninja'])
 
-  CHDIR = 'idl-excluded'
-  test.run_gyp('idl-excluded.gyp', chdir=CHDIR)
-  test.build('idl-excluded.gyp', test.ALL, chdir=CHDIR)
+  CHDIR = 'compiler-flags'
+  test.run_gyp('calling-convention.gyp', chdir=CHDIR)
+  test.build('calling-convention.gyp', test.ALL, chdir=CHDIR)
 
   test.pass_test()