[ios] Add eg2 tests for managed bookmarks

This CL adds eg2 tests for changes in crrev.com/c/2140953.

The test fixture in this CL must enable certain command-line flags
to be able to run the managed bookmarks enterprise policy.

The eg2 tests for managed bookmarks include testing:
- disabling long-press for managed items (URLs and folders)
- disabling swipe-to-delete for managed items (URLs and folders)
- disabling new folder context menu button when inside a managed folder
- disabling edit context menu button when inside a managed folder

Bug: 1065187
Change-Id: Ide92b87f03585d186b133f192d1e39a4fbbaa1cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2145260Reviewed-by: Sergio Collazos <sczs@chromium.org>
Commit-Queue: edchin <edchin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758848}

ios/chrome/browser/policy/BUILD.gn

@@ -99,13 +99,12 @@ source_set("eg2_tests") {
   testonly = true
 
   sources = [
-    "policy_app_interface.h",
-    "policy_app_interface_stub.mm",
     "policy_egtest.mm",
     "policy_platform_provider_egtest.mm",
   ]
 
   deps = [
+    ":eg_test_support+eg2",
     "//base",
     "//components/password_manager/core/common",
     "//components/policy:generated",
@@ -141,3 +140,20 @@ source_set("eg_app_support+eg2") {
   ]
   libs = [ "Foundation.framework" ]
 }
+
+source_set("eg_test_support+eg2") {
+  defines = [ "CHROME_EARL_GREY_2" ]
+  configs += [
+    "//build/config/compiler:enable_arc",
+    "//build/config/ios:xctest_config",
+  ]
+  testonly = true
+  sources = [
+    "policy_app_interface.h",
+    "policy_app_interface_stub.mm",
+  ]
+  deps = [
+    "//ios/testing/earl_grey:eg_test_support+eg2",
+    "//ios/third_party/earl_grey2:test_lib",
+  ]
+}

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

@@ -246,13 +246,17 @@ source_set("eg2_tests") {
     "bookmarks_folders_egtest.mm",
     "bookmarks_promo_egtest.mm",
     "bookmarks_search_egtest.mm",
+    "managed_bookmarks_egtest.mm",
   ]
   deps = [
     ":bookmarks_ui",
     ":eg_test_support+eg2",
     "//base/test:test_support",
+    "//components/policy:generated",
     "//components/strings",
     "//ios/chrome/app/strings",
+    "//ios/chrome/browser:utils",
+    "//ios/chrome/browser/policy:eg_test_support+eg2",
     "//ios/chrome/browser/ui/authentication:eg_test_support+eg2",
     "//ios/chrome/browser/ui/popup_menu:constants",
     "//ios/chrome/browser/ui/table_view:feature_flags",