Add check_tls test on nacl_irt to Gyp

ppapi/native_client/irt_test.gyp

Index: ppapi/native_client/irt_test.gyp
diff --git a/ppapi/native_client/irt_test.gyp b/ppapi/native_client/irt_test.gyp
new file mode 100644
index 0000000000000000000000000000000000000000..20546056b25dfbf7ff8cf30512ac36daba415f40
--- /dev/null
+++ b/ppapi/native_client/irt_test.gyp
@@ -0,0 +1,18 @@
+# Copyright (c) 2012 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+{
+  'conditions': [
+    ['disable_nacl==0 and disable_nacl_untrusted==0', {

[Mark Seaborn, 2012/09/14 21:01:42]

Maybe add a comment to say that this instantiates a test that checks, at build
time, the IRT's use of TLS-related instructions.

+      'variables': {
+        'irt_test_nexe': '',
+        'irt_test_dep': 'native_client.gyp:nacl_irt',
+      },
+      'includes': [
+        '../../native_client/build/common.gypi',
+        '../../native_client/src/untrusted/irt/check_tls.gypi',
+      ],
+    }],
+  ],
+}