Adds Compose Email Settings UI for deprecating Native App Launcher

ios/chrome/browser/web/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.
 
 import("//ios/web/js_compile.gni")
 
 source_set("web") {
   configs += [ "//build/config/compiler:enable_arc" ]
   sources = [
     "dom_altering_lock.h",
@@ skipping 47 matching lines @@
     "mailto_handler_system_mail_unittest.mm",
     "mailto_handler_unittest.mm",
     "mailto_url_rewriter_unittest.mm",
     "navigation_manager_util_unittest.mm",
     "network_activity_indicator_tab_helper_unittest.mm",
     "repost_form_tab_helper_unittest.mm",
     "sad_tab_tab_helper_unittest.mm",
   ]
   deps = [
     ":sad_tab_tab_helper_delegate",
+    ":test_support",
     ":web",
     "//base:base",
     "//base/test:test_support",
     "//components/strings:components_strings_grit",
     "//ios/chrome/browser/ui:ui",
     "//ios/chrome/browser/ui/sad_tab",
     "//ios/chrome/test:test_support",
     "//ios/web:test_support",
     "//ios/web:web_arc",
     "//testing/gtest",
@@ skipping 161 matching lines @@
     "//url",
   ]
   libs = [ "UIKit.framework" ]
 }
 
 source_set("test_support") {
   testonly = true
   sources = [
     "chrome_web_test.h",
     "chrome_web_test.mm",
+    "fake_mailto_handler_helpers.h",
+    "fake_mailto_handler_helpers.mm",
   ]
   deps = [
     "//components/password_manager/core/browser:test_support",
     "//ios/chrome/browser/browser_state:test_support",
     "//ios/chrome/browser/passwords",
     "//ios/chrome/browser/ui:ui_internal",
+    "//ios/chrome/browser/web",
     "//ios/web",
     "//ios/web:test_support",
   ]
 }
 
 source_set("unit_tests_internal") {
   configs += [ "//build/config/compiler:enable_arc" ]
   testonly = true
   sources = [
     "auto_reload_controller_unittest.mm",
@@ skipping 77 matching lines @@
     "early_page_script_perftest.mm",
   ]
   deps = [
     "//base",
     "//ios/chrome/test/base:perf_test_support",
     "//ios/web",
     "//ios/web:test_support",
   ]
   libs = [ "WebKit.framework" ]
 }