Include headless resources in Mac OS

chrome/chrome_paks.gni

 # Copyright 2016 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("//build/config/locales.gni")
 import("//chrome/common/features.gni")
 import("//extensions/features/features.gni")
 import("//ui/base/ui_features.gni")
 import("chrome_repack_locales.gni")
 
@@ skipping 139 matching lines @@
     if (is_chromeos) {
       sources += [
         "$root_gen_dir/components/chrome_apps/chrome_apps_resources.pak",
         "$root_gen_dir/ui/file_manager/file_manager_resources.pak",
       ]
       deps += [
         "//components/chrome_apps:resources",
         "//ui/file_manager:resources",
       ]
     }
-    if (is_linux) {
+    if (is_linux || is_mac) {
       sources += [ "$root_gen_dir/headless/headless_lib_resources.pak" ]
       deps += [ "//headless:resources" ]
     }
     if (enable_extensions) {
       sources += [
         "$root_gen_dir/extensions/extensions_renderer_resources.pak",
         "$root_gen_dir/extensions/extensions_resources.pak",
       ]
       deps += [ "//extensions:extensions_resources" ]
     }
@@ skipping 95 matching lines @@
       ":${target_name}_locales",
     ]
     if (enable_hidpi) {
       public_deps += [ ":${target_name}_200_percent" ]
     }
     if (defined(invoker.public_deps)) {
       public_deps += invoker.public_deps
     }
   }
 }