Add TestGypXcodeNinja to run tests against the xcode-ninja generator

test/ninja/chained-dependency/gyptest-chained-dependency.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 that files generated by two-steps-removed actions are built before
 dependent compile steps.
 """
 
 import os
 import sys
 import TestGyp
 
 # This test is Ninja-specific in that:
 # - the bug only showed nondeterministically in parallel builds;
 # - it relies on a ninja-specific output file path.
 
 test = TestGyp.TestGyp(formats=['ninja'])
+# xcode-ninja doesn't support building single object files by design.
+if test.format == 'xcode-ninja':
+  test.skip_test()
+
 test.run_gyp('chained-dependency.gyp')
 objext = '.obj' if sys.platform == 'win32' else '.o'
 test.build('chained-dependency.gyp',
            os.path.join('obj', 'chained.chained' + objext))
 # The test passes if the .o file builds successfully.
 test.pass_test()