Adds Compose Email Settings UI for deprecating Native App Launcher

ios/chrome/browser/ui/settings/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/app_icon_placeholder.png",
     "resources/app_icon_placeholder@2x.png",
     "resources/app_icon_placeholder@3x.png",
     "resources/encryption_error.png",
@@ skipping 31 matching lines @@
     "autofill_profile_edit_collection_view_controller.h",
     "autofill_profile_edit_collection_view_controller.mm",
     "bandwidth_management_collection_view_controller.h",
     "bandwidth_management_collection_view_controller.mm",
     "bar_button_activity_indicator.h",
     "bar_button_activity_indicator.mm",
     "block_popups_collection_view_controller.h",
     "block_popups_collection_view_controller.mm",
     "clear_browsing_data_collection_view_controller.h",
     "clear_browsing_data_collection_view_controller.mm",
+    "compose_email_handler_collection_view_controller.h",
+    "compose_email_handler_collection_view_controller.mm",
     "content_settings_collection_view_controller.h",
     "content_settings_collection_view_controller.mm",
     "contextual_search_collection_view_controller.h",
     "contextual_search_collection_view_controller.mm",
     "dataplan_usage_collection_view_controller.h",
     "dataplan_usage_collection_view_controller.mm",
     "do_not_track_collection_view_controller.h",
     "do_not_track_collection_view_controller.mm",
     "handoff_collection_view_controller.h",
     "handoff_collection_view_controller.mm",
@@ skipping 73 matching lines @@
     "//ios/chrome/browser/ui/content_suggestions/cells",
     "//ios/chrome/browser/ui/contextual_search",
     "//ios/chrome/browser/ui/icons",
     "//ios/chrome/browser/ui/keyboard",
     "//ios/chrome/browser/ui/material_components",
     "//ios/chrome/browser/ui/payments/cells",
     "//ios/chrome/browser/ui/settings/cells",
     "//ios/chrome/browser/ui/settings/utils",
     "//ios/chrome/browser/ui/sync",
     "//ios/chrome/browser/voice",
+    "//ios/chrome/browser/web",
     "//ios/chrome/common",
     "//ios/public/provider/chrome/browser",
     "//ios/public/provider/chrome/browser/images",
     "//ios/public/provider/chrome/browser/native_app_launcher",
     "//ios/public/provider/chrome/browser/signin",
     "//ios/public/provider/chrome/browser/user_feedback",
     "//ios/public/provider/chrome/browser/voice",
     "//ios/third_party/material_components_ios",
     "//ios/third_party/material_roboto_font_loader_ios",
     "//ios/web",
@@ skipping 188 matching lines @@
 source_set("unit_tests") {
   configs += [ "//build/config/compiler:enable_arc" ]
   testonly = true
   sources = [
     "about_chrome_collection_view_controller_unittest.mm",
     "autofill_collection_view_controller_unittest.mm",
     "autofill_profile_edit_collection_view_controller_unittest.mm",
     "bandwidth_management_collection_view_controller_unittest.mm",
     "block_popups_collection_view_controller_unittest.mm",
     "clear_browsing_data_collection_view_controller_unittest.mm",
+    "compose_email_handler_collection_view_controller_unittest.mm",
     "content_settings_collection_view_controller_unittest.mm",
     "contextual_search_collection_view_controller_unittest.mm",
     "dataplan_usage_collection_view_controller_unittest.mm",
     "do_not_track_collection_view_controller_unittest.mm",
     "import_data_collection_view_controller_unittest.mm",
     "native_apps_collection_view_controller_unittest.mm",
     "password_details_collection_view_controller_unittest.mm",
     "physical_web_collection_view_controller_unittest.mm",
     "privacy_collection_view_controller_unittest.mm",
     "save_passwords_collection_view_controller_unittest.mm",
@@ skipping 49 matching lines @@
     "//ios/chrome/browser/translate",
     "//ios/chrome/browser/ui/collection_view",
     "//ios/chrome/browser/ui/collection_view:test_support",
     "//ios/chrome/browser/ui/collection_view/cells",
     "//ios/chrome/browser/ui/commands",
     "//ios/chrome/browser/ui/contextual_search",
     "//ios/chrome/browser/ui/icons",
     "//ios/chrome/browser/ui/settings/cells",
     "//ios/chrome/browser/ui/sync",
     "//ios/chrome/browser/voice",
+    "//ios/chrome/browser/web",
     "//ios/chrome/browser/web:test_support",
     "//ios/chrome/common",
     "//ios/chrome/test:test_support",
     "//ios/public/provider/chrome/browser",
     "//ios/public/provider/chrome/browser/native_app_launcher:test_support",
     "//ios/public/provider/chrome/browser/voice",
     "//ios/third_party/material_components_ios",
     "//ios/web",
     "//ios/web:test_support",
     "//net",
@@ skipping 55 matching lines @@
     "//ios/web:test_support",
     "//net",
     "//ui/base",
     "//url",
   ]
   libs = [
     "UIKit.framework",
     "XCTest.framework",
   ]
 }