Create Memory Helper for memory warnings

ios/chrome/BUILD.gn

 # 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.
 
 import("//build/config/ios/rules.gni")
 import("//testing/test.gni")
 
 bundle_data("ios_chrome_unittests_bundle_data") {
   testonly = true
   sources = [
     "test/data/webdata/bookmarkimages/image.jpg",
     "test/data/webdata/bookmarkimages/index.html",
   ]
   outputs = [
     "{{bundle_resources_dir}}/{{source_root_relative_dir}}/" +
         "{{source_file_part}}",
   ]
 }
 
 bundle_data_xib("native_content_controller_test_xib") {
   testonly = true
   source = "browser/ui/native_content_controller_test.xib"
 }
 
 test("ios_chrome_unittests") {
   sources = [
+    "app/application_delegate/memory_warning_helper_unittest.mm",
     "app/safe_mode_util_unittest.cc",
     "browser/chrome_url_util_unittest.mm",
     "browser/crash_loop_detection_util_unittest.mm",
     "browser/favicon/large_icon_cache_unittest.cc",
     "browser/geolocation/CLLocation+XGeoHeaderTest.mm",
     "browser/geolocation/location_manager_unittest.mm",
     "browser/geolocation/omnibox_geolocation_local_state_unittest.mm",
     "browser/install_time_util_unittest.mm",
     "browser/installation_notifier_unittest.mm",
     "browser/metrics/ios_chrome_metrics_service_accessor_unittest.cc",
@@ skipping 51 matching lines @@
     "//ios/web",
     "//ios/web:test_support",
     "//net:test_support",
     "//skia",
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/ocmock",
     "//ui/gfx:test_support",
   ]
 }