Adds generator support for Xcode 5 xctest targets.

test/mac/xctest/TestSupport/testsupport.gyp

Index: test/mac/xctest/TestSupport/testsupport.gyp
diff --git a/test/mac/xctest/TestSupport/testsupport.gyp b/test/mac/xctest/TestSupport/testsupport.gyp
new file mode 100644
index 0000000000000000000000000000000000000000..2a2249d1b8b389797401e6cd1c05ce02d0a254ad
--- /dev/null
+++ b/test/mac/xctest/TestSupport/testsupport.gyp
@@ -0,0 +1,26 @@
+# Copyright (c) 2013 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.
+{
+  'targets': [
+    {
+      'target_name': 'test_support',
+      'type': 'static_library',
+      'dependencies': [
+        '../Shared/shared.gyp:shared',
+      ],
+      'sources': [
+        'Shared+TestSupportCategory.h',
+        'Shared+TestSupportCategory.m',
+        'TestSupport.h',
+        'TestSupport.m',
+      ],
+      'direct_dependent_settings': {
+        'include_dirs': [ '.' ],
+      },
+    'xcode_settings': {
+      'GCC_SYMBOLS_PRIVATE_EXTERN': 'NO',
+    },
+    },
+  ],
+}