Implementing sign-in promo for "Other Devices" on the iPad

ios/chrome/browser/ui/tab_switcher/BUILD.gn

 # Copyright 2016 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.
 
 bundle_data("resources") {
   sources = [
     "resources/tabswitcher_full_history.png",
     "resources/tabswitcher_full_history@2x.png",
     "resources/tabswitcher_full_history@3x.png",
     "resources/tabswitcher_incognito.png",
@@ skipping 91 matching lines @@
     "//ios/chrome/app/theme",
     "//ios/chrome/browser",
     "//ios/chrome/browser/browser_state",
     "//ios/chrome/browser/favicon",
     "//ios/chrome/browser/metrics:metrics_internal",
     "//ios/chrome/browser/sessions",
     "//ios/chrome/browser/signin",
     "//ios/chrome/browser/sync",
     "//ios/chrome/browser/tabs",
     "//ios/chrome/browser/ui",
+    "//ios/chrome/browser/ui/authentication:authentication_arc",
+    "//ios/chrome/browser/ui/authentication:authentication_ui",
     "//ios/chrome/browser/ui/colors",
     "//ios/chrome/browser/ui/commands",
     "//ios/chrome/browser/ui/keyboard",
     "//ios/chrome/browser/ui/material_components",
     "//ios/chrome/browser/ui/ntp/recent_tabs/views",
     "//ios/chrome/browser/ui/sync",
     "//ios/chrome/browser/ui/tabs",
     "//ios/chrome/browser/ui/toolbar",
     "//ios/chrome/common:ios_app_bundle_id_prefix_header",
     "//ios/public/provider/chrome/browser",
@@ skipping 74 matching lines @@
     "//ios/chrome/test/app:test_support",
     "//ios/chrome/test/earl_grey:test_support",
     "//ios/third_party/earl_grey",
     "//ui/base",
   ]
   libs = [
     "UIKit.framework",
     "XCTest.framework",
   ]
 }