Teach ninja to handle output directories outside the source dir.

test/generator-output/gyptest-actions.py

 #!/usr/bin/env python
 
 # Copyright (c) 2012 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 --generator-output= behavior when using actions.
 """
 
 import TestGyp
 
-# Ninja and Android don't support --generator-output.
-test = TestGyp.TestGyp(formats=['!ninja', '!android'])
+# Android doesn't support --generator-output.
+test = TestGyp.TestGyp(formats=['!android'])
 
 # All the generated files should go under 'gypfiles'. The source directory
 # ('actions') should be untouched.
 test.writable(test.workpath('actions'), False)
 test.run_gyp('actions.gyp',
              '--generator-output=' + test.workpath('gypfiles'),
              chdir='actions')
 
 test.writable(test.workpath('actions'), True)
 
@@ skipping 24 matching lines @@
 if test.format == 'xcode':
   chdir = 'relocate/actions/subdir1'
 else:
   chdir = 'relocate/gypfiles'
 test.run_built_executable('program', chdir=chdir, stdout=expect)
 
 test.must_match('relocate/actions/subdir2/actions-out/file.out',
                 "Hello from make-file.py\n")
 
 test.pass_test()