Mojo + NaCl prototype.

mojo/mojo_variables.gypi

 # Copyright 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.
 
 #
-# A set of GYP variables that are shared between mojo.gyp and mojo_base.gyp
+# A set of GYP variables that are shared between various mojo .gyp files.
 #
 {
   'variables': {
     'chromium_code': 1,
     'mojo_shell_debug_url%': "",
     'conditions': [
       #
       # The following mojo_system-prefixed variables are used to express a
       # dependency on the mojo system APIs.
       #
@@ skipping 17 matching lines @@
       ['component=="shared_library"', {
         'mojo_system_for_component': "../mojo/mojo_base.gyp:mojo_system_impl",
         'mojo_system_for_loadable_module': "../mojo/mojo_base.gyp:mojo_system_impl",
         'mojo_gles2_for_component': "../mojo/mojo_base.gyp:mojo_gles2_impl",
       }, {
         'mojo_system_for_component': "../mojo/mojo_base.gyp:mojo_none",
         'mojo_system_for_loadable_module': "../mojo/mojo_base.gyp:mojo_system",
         'mojo_gles2_for_component': "../mojo/mojo_base.gyp:mojo_none",
       }],
     ],
+    'mojo_public_system_unittest_sources': [
+      'public/c/system/tests/core_unittest.cc',
+      'public/c/system/tests/core_unittest_pure_c.c',
+      'public/c/system/tests/macros_unittest.cc',
+      'public/cpp/system/tests/core_unittest.cc',
+      'public/cpp/system/tests/macros_unittest.cc',
+    ],
   },
 }