Add TestGypXcodeNinja to run tests against the xcode-ninja generator

test/compiler-override/gyptest-compiler-env.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 the user can override the compiler and linker using CC/CXX/LD
 environment variables.
 """
 
 import TestGyp
@@ skipping 19 matching lines @@
     test.run_gyp(gypfile)
   test.build(gypfile)
 
   test.must_contain_all_lines(test.stdout(), check_for)
 
 
 test = TestGyp.TestGyp(formats=['ninja', 'make'])
 
 def TestTargetOveride():
   expected = ['my_cc.py', 'my_cxx.py', 'FOO' ]
-  if test.format != 'ninja':  # ninja just uses $CC / $CXX as linker.
+
+  # ninja just uses $CC / $CXX as linker.
+  if test.format not in ['ninja', 'xcode-ninja']:
     expected.append('FOO_LINK')
 
   # Check that CC, CXX and LD set target compiler
   oldenv = os.environ.copy()
   try:
     os.environ['CC'] = 'python %s/my_cc.py FOO' % here
     os.environ['CXX'] = 'python %s/my_cxx.py FOO' % here
     os.environ['LINK'] = 'python %s/my_ld.py FOO_LINK' % here
 
     CheckCompiler(test, 'compiler-exe.gyp', expected, True)
@@ skipping 46 matching lines @@
     os.environ.update(oldenv)
 
   # Run the same tests once the eviron has been restored.  The
   # generated should have embedded all the settings in the
   # project files so the results should be the same.
   CheckCompiler(test, 'compiler-host.gyp', expected, False)
 
 
 TestTargetOveride()
 TestTargetOverideCompilerOnly()
-TestHostOveride()
 
 test.pass_test()