[wip] ozonex: X11 backend for ozone.

ui/ozone/ozone.gyp

 # Copyright 2013 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.
 
 {
   'variables': {
     'chromium_code': 1,
     'external_ozone_platforms': [],
     'external_ozone_platform_files': [],
     'external_ozone_platform_deps': [],
@@ skipping 87 matching lines @@
     ['<(ozone_platform_egltest) == 1', {
       'includes': [
         'platform/egltest/egltest.gypi',
       ],
     }],
     ['<(ozone_platform_test) == 1', {
       'includes': [
         'platform/test/test.gypi',
       ],
     }],
+   ['<(ozone_platform_ozonex) == 1', {
+     'includes': [
+       'platform/ozonex/ozonex.gyp',
+     ],
+   }],
   ],
 }