Add context menu when long press on a reading list entry

ios/chrome/browser/ui/reading_list/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.
 
 bundle_data("resources") {
   sources = [
     "resources/distillation_fail.png",
     "resources/distillation_fail@2x.png",
     "resources/distillation_fail@3x.png",
     "resources/distillation_success.png",
@@ skipping 48 matching lines @@
     "//ios/chrome/browser/reading_list",
     "//ios/chrome/browser/tabs",
     "//ios/chrome/browser/ui",
     "//ios/chrome/browser/ui/alert_coordinator",
     "//ios/chrome/browser/ui/collection_view/cells",
     "//ios/chrome/browser/ui/colors",
     "//ios/chrome/browser/ui/keyboard",
     "//ios/chrome/browser/ui/material_components",
     "//ios/chrome/browser/ui/side_swipe",
     "//ios/chrome/browser/ui/static_content",
+    "//ios/chrome/browser/ui/util",
     "//ios/chrome/common",
     "//ios/third_party/material_components_ios",
     "//ios/third_party/material_roboto_font_loader_ios",
     "//ios/web",
     "//net",
     "//ui/base",
+    "//ui/strings",
     "//url",
   ]
   public_deps = [
     "//components/reading_list/ios",
     "//ios/chrome/browser/ui/collection_view",
   ]
   allow_circular_includes_from = [ "//ios/chrome/browser/ui/side_swipe" ]
   libs = [ "UIKit.framework" ]
 }
 
 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 = [
     ":reading_list",
     "//base",
     "//components/favicon/core",
     "//components/prefs",
     "//components/reading_list/ios",
     "//ios/chrome/browser/browser_state:test_support",
     "//ios/chrome/browser/favicon",
     "//ios/chrome/browser/reading_list",
     "//ios/chrome/browser/tabs",
     "//ios/chrome/browser/ui",
     "//ios/chrome/browser/ui/static_content",
     "//ios/web",
     "//ios/web:test_support",
     "//testing/gtest",
     "//third_party/ocmock",
+    "//ui/base",
   ]
 }
 
 source_set("eg_tests") {
   testonly = true
   sources = [
     "reading_list_egtest.mm",
   ]
   deps = [
     ":reading_list",
     "//base",
     "//components/reading_list/ios",
     "//ios/chrome/app/strings",
     "//ios/chrome/browser/reading_list",
     "//ios/chrome/browser/ui/commands",
     "//ios/chrome/test/app:test_support",
     "//ios/chrome/test/earl_grey:test_support",
     "//ios/testing:ios_test_support",
     "//ios/third_party/earl_grey",
     "//ios/third_party/material_components_ios",
     "//ios/web:test_support",
   ]
   libs = [
     "UIKit.framework",
     "XCTest.framework",
   ]
 }