[iOS] Add a repack steps to iOS upstream for unit tests

ios/chrome/ios_chrome_repack_resources.gypi

Index: ios/chrome/ios_chrome_repack_resources.gypi
diff --git a/ios/chrome/ios_chrome_repack_resources.gypi b/ios/chrome/ios_chrome_repack_resources.gypi
new file mode 100644
index 0000000000000000000000000000000000000000..a3b1bd2f5c9c8006319f8b7801220142729644e2
--- /dev/null
+++ b/ios/chrome/ios_chrome_repack_resources.gypi
@@ -0,0 +1,15 @@
+# Copyright 2015 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': [
+      '<(SHARED_INTERMEDIATE_DIR)/components/components_resources.pak',
+      '<(SHARED_INTERMEDIATE_DIR)/net/net_resources.pak',
+      '<(SHARED_INTERMEDIATE_DIR)/ui/resources/webui_resources.pak',
+    ],
+    'pak_output': '<(SHARED_INTERMEDIATE_DIR)/repack_ios/resources.pak',
+  },
+  'includes': [ '../../build/repack_action.gypi' ],
+}