Add TestGypXcodeNinja to run tests against the xcode-ninja generator

test/dependencies/gyptest-lib-only.py

Index: test/dependencies/gyptest-lib-only.py
diff --git a/test/dependencies/gyptest-lib-only.py b/test/dependencies/gyptest-lib-only.py
index 283c29ee0f17fc6b707d02e58f5996a07d8ff1b4..3a99a7f4aa61e0305a75026de386614a3daf27db 100755
--- a/test/dependencies/gyptest-lib-only.py
+++ b/test/dependencies/gyptest-lib-only.py
@@ -29,7 +29,7 @@ if sys.platform == 'darwin':
   if test.format == 'xcode':
     test.built_file_must_not_exist('b', type=test.STATIC_LIB)
   else:
-    assert test.format in ('make', 'ninja')
+    assert test.format in ('make', 'ninja', 'xcode-ninja')
     test.built_file_must_exist('b', type=test.STATIC_LIB)
 else:
   # Make puts the resulting library in a directory matching the input gyp file;