Adds tls_edit utility which patches irt_core.nexe's TLS usage.

src/tools/tls_edit/tls_edit.gyp

Index: src/tools/tls_edit/tls_edit.gyp
diff --git a/src/tools/tls_edit/tls_edit.gyp b/src/tools/tls_edit/tls_edit.gyp
new file mode 100644
index 0000000000000000000000000000000000000000..35cf052a5c667f9d7964f0550f39b07e4bc95d7f
--- /dev/null
+++ b/src/tools/tls_edit/tls_edit.gyp
@@ -0,0 +1,23 @@
+# Copyright (c) 2014 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.
+
+{
+  'includes': [
+    '../../../build/common.gypi',
+  ],
+  'targets': [
+    {
+      'target_name': 'tls_edit',
+      'type': 'executable',
+      'toolsets': ['host'],
+      'sources': [
+        'tls_edit.c',
+      ],
+      'dependencies': [
+        '<(DEPTH)/native_client/src/shared/platform/platform.gyp:platform',
+        '<(DEPTH)/native_client/src/trusted/validator_ragel/rdfa_validator.gyp:rdfa_validator',
+      ],
+    },
+  ],
+}