Add context menu when long press on a reading list entry

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

Index: ios/chrome/browser/ui/reading_list/BUILD.gn
diff --git a/ios/chrome/browser/ui/reading_list/BUILD.gn b/ios/chrome/browser/ui/reading_list/BUILD.gn
index 4d8c453c75cab85c2834ba06006bff7bfdf2e1a0..80c9e3fdaf22bee1adf5d05d67548df29616935d 100644
--- a/ios/chrome/browser/ui/reading_list/BUILD.gn
+++ b/ios/chrome/browser/ui/reading_list/BUILD.gn
@@ -72,6 +72,7 @@ source_set("reading_list") {
     "//ios/web",
     "//net",
     "//ui/base",
+    "//ui/strings",
     "//url",
   ]
   public_deps = [
@@ -86,6 +87,7 @@ source_set("unit_tests") {
   testonly = true
   sources = [
     "offline_page_native_content_unittest.mm",
+    "reading_list_view_controller_container_unittest.mm",
     "reading_list_view_controller_unittest.mm",
   ]
   deps = [
@@ -104,6 +106,7 @@ source_set("unit_tests") {
     "//ios/web:test_support",
     "//testing/gtest",
     "//third_party/ocmock",
+    "//ui/base",
   ]
 }