Load application manifests from resources

content/content_resources.gypi

 # Copyright (c) 2012 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.
 
 {
   'targets': [
     {
       # GN version: //content:resources
       'target_name': 'content_resources',
       'type': 'none',
       'variables': {
         'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/content',
       },
       'actions': [
         {
           'action_name': 'generate_content_resources',
           'variables': {
             'grit_grd_file': 'content_resources.grd',
+            'grit_additional_defines': [
+              '-E', 'root_out_dir=<(PRODUCT_DIR)',
+            ],
           },
           'includes': [ '../build/grit_action.gypi' ],
         },
       ],
       'copies': [
         {
           'destination': '<(PRODUCT_DIR)',
           'files': [
             '<(SHARED_INTERMEDIATE_DIR)/content/content_resources.pak'
           ],
         },
       ],
+      'dependencies': [
+        '<(DEPTH)/mojo/mojo_shell.gyp:mojo_catalog_manifest',
+        'content_app_browser_manifest',
+        'content_app_renderer_manifest',
+      ],
     },
   ],
 }