[Mac/GN] Initial mac_app_bundle template.

content/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("//build/config/features.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/config/ui.gni")
 import("//build/config/win/console_app.gni")
 import("//build/config/win/manifest.gni")
 import("//media/media_options.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//tools/grit/repack.gni")
 import("//tools/grit/grit_rule.gni")
 if (is_android) {
   import("//build/config/android/config.gni")
+} else if (is_mac) {
+  import("//build/config/mac/rules.gni")
 }
 
 declare_args() {
   content_shell_product_name = "Content Shell"
   content_shell_version = "99.77.34.5"
 }
 
 config("content_shell_lib_warnings") {
   if (is_clang) {
     # TODO(thakis): Remove this once http://crbug.com/383820 is figured out
@@ skipping 487 matching lines @@
 
     sources = [
       "app/shell_content_main.cc",
       "app/shell_content_main.h",
     ]
 
     deps = [
       ":content_shell_lib",
     ]
   }
+
+  mac_app_bundle("content_shell_helper_app") {
+    testonly = true
+    output_name = "$content_shell_product_name Helper"
+    sources = [
+      "app/shell_main.cc",
+    ]
+    deps = [
+      ":framework",
+    ]
+    info_plist = "app/helper-Info.plist"
+  }
 }
 
 mojom("mojo_bindings") {
   sources = [
     "common/layout_test/layout_test_bluetooth_fake_adapter_setter.mojom",
   ]
 }