GN: Get os="chromeos" use_ozone=true to compile

extensions/shell/BUILD.gn

 # 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.
 
 import("//tools/grit/grit_rule.gni")
 
 assert(enable_extensions)
 
 grit("resources") {
   source = "app_shell_resources.grd"
@@ skipping 111 matching lines @@
   ]
   if (is_chromeos) {
     deps += [
       "//chromeos",
       "//ui/chromeos:ui_chromeos",
       "//ui/display",
     ]
   }
 }
 
-if (!is_chromeos) {
+if (!(is_chromeos && !use_ozone)) {
     executable("app_shell") {
     # testonly because :app_shell_lib is testonly. See :app_shell_lib comment.
     testonly = true
     deps = [
         ":app_shell_lib",
         "//extensions:shell_and_test_pak",
     ]
     sources = [ "app/shell_main.cc" ]
     }
 }
@@ skipping 15 matching lines @@
     version_h
   ]
   outputs = [ "$target_gen_dir/common/version.h" ]
   args = [
     "-f", rebase_path(lastchange_path, root_build_dir),
     "-e", "VERSION_FULL=\"$version_full\"",
     rebase_path(version_h, root_build_dir),
     rebase_path("$target_gen_dir/common/version.h")
   ]
 }