Add first layout for the suggested articles

ios/chrome/browser/ui/content_suggestions/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.
 
 source_set("content_suggestions") {
   configs += [ "//build/config/compiler:enable_arc" ]
   sources = [
     "content_suggestion.h",
     "content_suggestion.mm",
     "content_suggestion_identifier.h",
@@ skipping 21 matching lines @@
     "content_suggestions_text_item.mm",
     "content_suggestions_text_item_actions.h",
     "content_suggestions_view_controller.h",
     "content_suggestions_view_controller.mm",
     "expandable_item.h",
   ]
   deps = [
     "//base",
     "//ios/chrome/browser/ui",
     "//ios/chrome/browser/ui/collection_view",
+    "//ios/chrome/browser/ui/colors",
     "//ios/third_party/material_roboto_font_loader_ios",
     "//ui/base",
     "//url",
   ]
   public_deps = [
     "//ios/third_party/material_components_ios",
   ]
 }
 
 source_set("unit_tests") {
   configs += [ "//build/config/compiler:enable_arc" ]
   testonly = true
   sources = [
     "content_suggestion_identifier_unittest.mm",
     "content_suggestions_article_item_unittest.mm",
     "content_suggestions_expandable_item_unittest.mm",
     "content_suggestions_favicon_item_unittest.mm",
     "content_suggestions_stack_item_unittest.mm",
     "content_suggestions_text_item_unittest.mm",
   ]
   deps = [
     ":content_suggestions",
     "//base",
     "//ios/chrome/browser/ui/collection_view",
     "//testing/gtest",
     "//third_party/ocmock",
     "//url",
   ]
 }