Add test to check all current accelerators having keyboard overlay.

chrome/test/BUILD.gn

 # Copyright 2014 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/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/common/features.gni")
@@ skipping 2354 matching lines @@
         "../browser/chromeos/system/device_disabling_browsertest.cc",
         "../browser/chromeos/system/tray_accessibility_browsertest.cc",
         "../browser/download/notification/download_notification_browsertest.cc",
         "../browser/drive/drive_notification_manager_factory_browsertest.cc",
         "../browser/extensions/api/certificate_provider/certificate_provider_apitest.cc",
         "../browser/extensions/api/hotword_private/hotword_private_apitest.cc",
         "../browser/extensions/api/vpn_provider/vpn_provider_apitest.cc",
         "../browser/ui/ash/launcher/arc_app_launcher_browsertest.cc",
         "../browser/ui/views/arc_app_dialog_view_browsertest.cc",
         "../browser/ui/views/frame/browser_frame_ash_browsertest.cc",
+        "../browser/ui/webui/chromeos/keyboard_overlay_ui_browsertest.cc",
         "../browser/ui/webui/options/chromeos/accounts_options_browsertest.cc",
         "../browser/ui/webui/options/chromeos/guest_mode_options_browsertest.cc",
         "../browser/ui/webui/options/chromeos/guest_mode_options_browsertest.h",
         "../browser/ui/webui/options/chromeos/guest_mode_options_ui_browsertest.cc",
         "../browser/ui/webui/options/chromeos/shared_options_browsertest.cc",
         "//ui/base/ime/chromeos/input_method_whitelist.cc",
         "//ui/base/ime/chromeos/input_method_whitelist.h",
       ]
       sources -= [
         "../../apps/load_and_launch_browsertest.cc",
@@ skipping 2852 matching lines @@
 }
 
 if (is_win) {
   loadable_module("conflicts_dll") {
     testonly = true
     sources = [
       "conflicts/conflicts_dll.cc",
     ]
   }
 }