Create a new app_strings target that builds strings for the app_base and even...

app/app.gyp

 # Copyright (c) 2009 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/common.gypi',
@@ skipping 24 matching lines @@
         ['include', '/win_[^/]*\\.cc$'],
       ]}],
     ],
   },
   'targets': [
     {
       'target_name': 'app_base',
       'type': '<(library)',
       'msvs_guid': '4631946D-7D5F-44BD-A5A8-504C0A7033BE',
       'dependencies': [
+        'app_strings',
         '../base/base.gyp:base',
         '../base/base.gyp:base_gfx',
         '../net/net.gyp:net',
         '../skia/skia.gyp:skia',
         '../third_party/icu38/icu38.gyp:icui18n',
         '../third_party/icu38/icu38.gyp:icuuc',
       ],
       'include_dirs': [
         '..',
         '../chrome/third_party/wtl/include',
@@ skipping 102 matching lines @@
             }],
           ],
         }],
       ],
     },
     {
       'target_name': 'app_unittests',
       'type': 'executable',
       'msvs_guid': 'B4D59AE8-8D2F-97E1-A8E9-6D2826729530',
       'dependencies': [
-        '../app/app.gyp:app_base',
+        'app_base',
         '../net/net.gyp:net_test_support',
         '../skia/skia.gyp:skia',
         '../testing/gtest.gyp:gtest',
         '../third_party/icu38/icu38.gyp:icui18n',
         '../third_party/icu38/icu38.gyp:icuuc',
         '../third_party/libxml/libxml.gyp:libxml',
       ],
       'sources': [
         'animation_unittest.cc',
         'gfx/font_unittest.cc',
@@ skipping 22 matching lines @@
         }],
         ['OS!="win"', {
           'sources!': [
             'gfx/icon_util_unittest.cc',
             'os_exchange_data_win_unittest.cc',
             'win_util_unittest.cc',
           ],
         }],
       ],
     },
+    {
+      'target_name': 'app_strings',
+      'type': 'none',
+      'msvs_guid': 'AE9BF4A2-19C5-49D8-BB1A-F28496DD7051',
+      'variables': {
+        'grit_path': '../tools/grit/grit.py',
+        'grit_out_dir': '<(SHARED_INTERMEDIATE_DIR)/app',
+      },
+      'actions': [
+        {
+          'action_name': 'app_strings',
+          'variables': {
+            'input_path': 'resources/app_strings.grd',
+          },
+          'inputs': [
+            '<(input_path)',
+          ],
+          'outputs': [
+            '<(grit_out_dir)/grit/app_strings.h',
+            '<(grit_out_dir)/app_strings_en-US.pak',
+            '<(grit_out_dir)/app_strings_en-US.rc',
+          ],
+          'action': ['python', '<(grit_path)', '-i', '<(input_path)', 'build', '-o', '<(grit_out_dir)'],
+          'message': 'Generating resources from <(input_path)',
+        },
+      ],
+      'direct_dependent_settings': {
+        'include_dirs': [
+          '<(SHARED_INTERMEDIATE_DIR)/app',
+        ],
+      },
+      'conditions': [
+        ['OS=="win"', {
+          'dependencies': ['../build/win/system.gyp:cygwin'],
+        }],
+      ],
+    },
   ],
 }