Add a footer item for the Content Suggestions

ios/chrome/browser/ui/content_suggestions/BUILD.gn

Index: ios/chrome/browser/ui/content_suggestions/BUILD.gn
diff --git a/ios/chrome/browser/ui/content_suggestions/BUILD.gn b/ios/chrome/browser/ui/content_suggestions/BUILD.gn
index 184ac543a1950dfe99962639061e6177b8a899c8..0e274b4dd8665a3ef937b50daf4147313155174c 100644
--- a/ios/chrome/browser/ui/content_suggestions/BUILD.gn
+++ b/ios/chrome/browser/ui/content_suggestions/BUILD.gn
@@ -22,6 +22,8 @@ source_set("content_suggestions") {
     "content_suggestions_favicon_internal_cell.mm",
     "content_suggestions_favicon_item.h",
     "content_suggestions_favicon_item.mm",
+    "content_suggestions_footer_item.h",
+    "content_suggestions_footer_item.mm",
     "content_suggestions_image_fetcher.h",
     "content_suggestions_section_information.h",
     "content_suggestions_section_information.mm",
@@ -58,6 +60,7 @@ source_set("unit_tests") {
     "content_suggestions_article_item_unittest.mm",
     "content_suggestions_expandable_item_unittest.mm",
     "content_suggestions_favicon_item_unittest.mm",
+    "content_suggestions_footer_item_unittest.mm",
     "content_suggestions_stack_item_unittest.mm",
     "content_suggestions_text_item_unittest.mm",
   ]