Add TestGypXcodeNinja to run tests against the xcode-ninja generator

test/sibling/gyptest-all.py

Index: test/sibling/gyptest-all.py
diff --git a/test/sibling/gyptest-all.py b/test/sibling/gyptest-all.py
index c1fb17a7ff513fe2270b12dd755d18ba9adaa756..318e1a3d843ba6bc51d448deebee438b4834b488 100755
--- a/test/sibling/gyptest-all.py
+++ b/test/sibling/gyptest-all.py
@@ -8,6 +8,12 @@ import TestGyp
 
 test = TestGyp.TestGyp()
 
+# The xcode-ninja generator handles gypfiles which are not at the
+# project root incorrectly.
+# cf. https://code.google.com/p/gyp/issues/detail?id=460
+if test.format == 'xcode-ninja':
+  test.skip_test()
+
 test.run_gyp('build/all.gyp', chdir='src')
 
 test.build('build/all.gyp', test.ALL, chdir='src')