Add a message to empty ContentSuggestions sections

ios/chrome/test/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("//ios/build/config.gni")
 import("//ios/public/provider/chrome/browser/build_config.gni")
 import("//testing/test.gni")
 
 # All tests needs to be listed in that target to be built as part of
 # "gn_all" target (i.e. by the bots).
@@ skipping 133 matching lines @@
     "//ios/chrome/browser/ui:unit_tests",
     "//ios/chrome/browser/ui/activity_services:unit_tests",
     "//ios/chrome/browser/ui/alert_coordinator:unit_tests",
     "//ios/chrome/browser/ui/authentication:unit_tests",
     "//ios/chrome/browser/ui/autofill/cells:unit_tests",
     "//ios/chrome/browser/ui/bookmarks:unit_tests",
     "//ios/chrome/browser/ui/bookmarks/cells:unit_tests",
     "//ios/chrome/browser/ui/collection_view:unit_tests",
     "//ios/chrome/browser/ui/collection_view/cells:unit_tests",
     "//ios/chrome/browser/ui/commands:unit_tests",
+    "//ios/chrome/browser/ui/content_suggestions:unit_tests",
     "//ios/chrome/browser/ui/content_suggestions/cells:unit_tests",
     "//ios/chrome/browser/ui/content_suggestions/identifier:unit_tests",
     "//ios/chrome/browser/ui/context_menu:unit_tests",
     "//ios/chrome/browser/ui/contextual_search:unit_tests",
     "//ios/chrome/browser/ui/dialogs:unit_tests",
     "//ios/chrome/browser/ui/dialogs:unit_tests_internal",
     "//ios/chrome/browser/ui/downloads:unit_tests",
     "//ios/chrome/browser/ui/elements:unit_tests",
     "//ios/chrome/browser/ui/fancy_ui:unit_tests",
     "//ios/chrome/browser/ui/first_run:unit_tests",
@@ skipping 25 matching lines @@
     "//ios/chrome/common:unit_tests",
     "//ios/chrome/test/base:unit_tests",
     "//ios/shared/chrome/browser/tabs:unit_tests",
     "//ios/shared/chrome/browser/ui/browser_list:unit_tests",
     "//ios/shared/chrome/browser/ui/commands:unit_tests",
     "//ios/shared/chrome/browser/ui/coordinators:unit_tests",
   ]
 
   assert_no_deps = ios_assert_no_deps
 }