Add TestGypXcodeNinja to run tests against the xcode-ninja generator

test/mac/gyptest-cflags.py

Index: test/mac/gyptest-cflags.py
diff --git a/test/mac/gyptest-cflags.py b/test/mac/gyptest-cflags.py
index 7d24863df5d295ac45736ae05e6ff911325b7539..72430cad40e07a18de3bb03afd6fee7b121bb185 100644
--- a/test/mac/gyptest-cflags.py
+++ b/test/mac/gyptest-cflags.py
@@ -15,6 +15,9 @@ import sys
 if sys.platform == 'darwin':
   test = TestGyp.TestGyp(formats=['ninja', 'make', 'xcode'])
   CHDIR = 'cflags'
-  test.run_gyp('test.gyp', chdir=CHDIR)
+  test.run_gyp('test.gyp',
+               '-G', 'xcode_ninja_target_pattern=^.*$',
+               chdir=CHDIR)
+
   test.build('test.gyp', test.ALL, chdir=CHDIR)
   test.pass_test()