Add TestGypXcodeNinja to run tests against the xcode-ninja generator

test/mac/gyptest-prefixheader.py

Index: test/mac/gyptest-prefixheader.py
diff --git a/test/mac/gyptest-prefixheader.py b/test/mac/gyptest-prefixheader.py
index 768551f9b0f4a94f5fcb3408f9c0c129a715dab5..6b18b8282e6d7ae124ba3c648024d608f3682d9d 100755
--- a/test/mac/gyptest-prefixheader.py
+++ b/test/mac/gyptest-prefixheader.py
@@ -14,6 +14,9 @@ import sys
 
 if sys.platform == 'darwin':
   test = TestGyp.TestGyp(formats=['ninja', 'make', 'xcode'])
-  test.run_gyp('test.gyp', chdir='prefixheader')
+  test.run_gyp('test.gyp',
+               '-G', 'xcode_ninja_target_pattern=^.*$',
+               chdir='prefixheader')
+
   test.build('test.gyp', test.ALL, chdir='prefixheader')
   test.pass_test()