Add the BUILD files for content_resources.

content/app/resources/content_resources.gyp

 # 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.
 
 {
   'targets': [
     {
-      # GN version: //webkit/glue/resources
-      'target_name': 'webkit_resources',
+      # GN version: //content/app/resources
+      'target_name': 'content_resources',
       'type': 'none',
       'variables': {
-        'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/webkit',
+        'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/content/app/resources/',
       },
       'actions': [
         {
-          'action_name': 'generate_webkit_resources',
+          'action_name': 'generate_content_resources',
           'variables': {
-            'grit_grd_file': 'webkit_resources.grd',
+            'grit_grd_file': 'content_resources.grd',
           },
           'includes': [ '../../../build/grit_action.gypi' ],
         },
       ],
       'includes': [ '../../../build/grit_target.gypi' ],
     },
   ]
 }