Introduces chromium_resources.gyp to factor out Chrome resource generation

chrome/chrome_repack_resources.gypi

+# Copyright (c) 2011 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.
+{
+  'action_name': 'repack_resources',
+  'variables': {
+    'pak_inputs': [
+      '<(grit_out_dir)/component_extension_resources.pak',
+      '<(grit_out_dir)/devtools_frontend_resources.pak',
+      '<(grit_out_dir)/devtools_resources.pak',
+      '<(grit_out_dir)/net_internals_resources.pak',
+      '<(grit_out_dir)/options_resources.pak',
+      '<(grit_out_dir)/shared_resources.pak',
+      '<(grit_out_dir)/sync_internals_resources.pak',
+      '<(grit_out_dir)/workers_resources.pak',
+    ],
+    'conditions': [
+      ['OS != "mac"', {
+        'pak_inputs': [
+          '<(grit_out_dir)/quota_internals_resources.pak',
+        ],
+      }],
+    ],
+  },
+  'inputs': [
+    '<(repack_path)',
+    '<@(pak_inputs)',
+  ],
+  'outputs': [
+    '<(INTERMEDIATE_DIR)/repack/resources.pak',
+  ],
+  'action': ['python', '<(repack_path)', '<@(_outputs)', '<@(pak_inputs)'],
+}