Add Desktop iOS promotion logging to chrome ios app.

ios/chrome/app/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/ios/rules.gni")
 import("//build/config/mac/base_rules.gni")
 import("//build/mac/tweak_info_plist.gni")
 import("//ios/build/chrome_build.gni")
 import("//ios/public/provider/chrome/browser/build_config.gni")
 
@@ skipping 155 matching lines @@
     "//ios/chrome/browser",
     "//ios/chrome/browser:browser_internal",
     "//ios/chrome/browser/bookmarks",
     "//ios/chrome/browser/browser_state",
     "//ios/chrome/browser/browser_state:browser_state_impl",
     "//ios/chrome/browser/browsing_data",
     "//ios/chrome/browser/browsing_data:browsing_data_internal",
     "//ios/chrome/browser/content_settings",
     "//ios/chrome/browser/crash_report",
     "//ios/chrome/browser/crash_report:crash_report_internal",
+    "//ios/chrome/browser/desktop_promotion",
     "//ios/chrome/browser/favicon",
     "//ios/chrome/browser/first_run",
     "//ios/chrome/browser/geolocation",
     "//ios/chrome/browser/geolocation:geolocation_internal",
     "//ios/chrome/browser/history",
     "//ios/chrome/browser/memory",
     "//ios/chrome/browser/metrics",
     "//ios/chrome/browser/metrics:metrics_internal",
     "//ios/chrome/browser/native_app_launcher:native_app_launcher_internal",
     "//ios/chrome/browser/net",
@@ skipping 132 matching lines @@
       "//ios/chrome/share_extension",
     ]
     sources = [
       "$root_out_dir/share_extension.appex",
     ]
     outputs = [
       "{{bundle_plugins_dir}}/{{source_file_part}}",
     ]
   }
 }