Wire up an api to darken screen for accessibility

chrome/browser/resources/chromeos/chromevox/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/features.gni")
 import("//chrome/common/features.gni")
 import("//testing/test.gni")
 import("//chrome/test/base/js2gtest.gni")
 import("run_jsbundler.gni")
 
@@ skipping 127 matching lines @@
   "cvox2/background/keyboard_handler.js",
   "cvox2/background/live_regions.js",
   "cvox2/background/media_automation_handler.js",
   "cvox2/background/next_earcons.js",
   "cvox2/background/notifications.js",
   "cvox2/background/output.js",
   "cvox2/background/panel.js",
   "cvox2/background/panel_command.js",
   "cvox2/background/panel_menu.js",
   "cvox2/background/panel_menu_item.js",
-  "cvox2/background/stubs.js",
   "cvox2/background/tabs_automation_handler.js",
   "cvox2/background/tree_walker.js",
   "cvox2/background/tutorial.js",
   "cvox2/injected/keyboard_handler.js",
   "cvox2/injected/loader.js",
   "extensions/searchvox/abstract_result.js",
   "extensions/searchvox/constants.js",
   "extensions/searchvox/context_menu.js",
   "extensions/searchvox/loader.js",
   "extensions/searchvox/results.js",
@@ skipping 522 matching lines @@
   ]
   gen_include_files = [
     "testing/assert_additions.js",
     "testing/callback_helper.js",
     "testing/chromevox_e2e_test_base.js",
     "testing/chromevox_next_e2e_test_base.js",
     "testing/mock_feedback.js",
   ]
   defines = [ "HAS_OUT_OF_PROC_TEST_RUNNER" ]
 }