[iOS] Allow use of extra entitlements for EG tests.

ios/chrome/test/earl_grey/chrome_ios_eg_test.gni

 # 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("//build/mac/tweak_info_plist.gni")
 import("//ios/build/chrome_build.gni")
 import("//ios/public/provider/chrome/browser/build_config.gni")
 import("//ios/third_party/earl_grey/ios_eg_test.gni")
 
 # Template wrapping ios_eg_test, setting default values for EarlGrey test
@@ skipping 35 matching lines @@
 template("chrome_ios_eg_test") {
   if (!defined(entitlements_path) && !defined(entitlements_target)) {
     _target_name = target_name
     _tweak_entitlements = target_name + "_tweak_entitlements"
     compile_plist(_tweak_entitlements) {
       format = "xml1"
       substitutions = [ "IOS_BUNDLE_ID_PREFIX=$ios_app_bundle_id_prefix" ]
       output_name = "$target_gen_dir/$_target_name.entitlements"
       plist_templates =
           [ "//ios/chrome/test/earl_grey/resources/Chrome.entitlements" ]
+      if (ios_chrome_entitlements_additions != []) {
+        plist_templates += ios_chrome_entitlements_additions
+      }
     }
   }
 
   if (!defined(info_plist) && !defined(info_plist_target)) {
     _tweak_info_plist = target_name + "_tweak_info_plist"
     tweak_info_plist(_tweak_info_plist) {
       info_plists = [
         "//ios/chrome/app/resources/Info.plist",
         "//ios/chrome/app/resources/EarlGreyAddition+Info.plist",
       ]
@@ skipping 66 matching lines @@
       "CHROMIUM_SHORT_NAME=$target_name",
       "CHROMIUM_URL_SCHEME_1=$url_unsecure_scheme",
       "CHROMIUM_URL_SCHEME_2=$url_secure_scheme",
       "CHROMIUM_URL_SCHEME_3=$url_x_callback_scheme",
       "CHROMIUM_URL_SCHEME_4=$url_channel_scheme",
       "EG_MAIN_APPLICATION_DELEGATE=$_eg_main_application_delegate",
       "SSOAUTH_URL_SCHEME=$url_ssoauth_scheme",
     ]
   }
 }