ninja: Support --toplevel-dir.

test/toplevel-dir/gyptest-toplevel-dir.py

 #!/usr/bin/env python
 
 # Copyright (c) 2009 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.
 
 """
 Verifies building a subsidiary dependent target from a .gyp file in a
 subdirectory, without specifying an explicit output build directory,
 and using the subdirectory's solution or project file as the entry point.
 """
 
 import TestGyp
 import errno
 
-test = TestGyp.TestGyp(formats=['make'])
+test = TestGyp.TestGyp(formats=['ninja', 'make'])
 
 # We want our Makefile to be one dir up from main.gyp.
 test.run_gyp('main.gyp', '--toplevel-dir=..', chdir='src/sub1')
 
 toplevel_dir = 'src'
 
 test.build('all', chdir=toplevel_dir)
 
 test.built_file_must_exist('prog1', type=test.EXECUTABLE, chdir=toplevel_dir)
 
 test.run_built_executable('prog1',
                           chdir=toplevel_dir,
                           stdout="Hello from prog1.c\n")
 
 test.pass_test()