OOBE: Add description to JSChecker::CreateFocusWaiter

Bug: none
Change-Id: Ic2e1a8e0eee10c5c4f7f33200247019d427764cb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2643719
Commit-Queue: Ossama Mahmoud <osamafathy@google.com>
Reviewed-by: Roman Sorokin [CET] <rsorokin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#846106}

chrome/browser/chromeos/login/test/js_checker.cc

@@ -224,8 +224,12 @@ void JSChecker::ExpectFocused(
 
 std::unique_ptr<TestConditionWaiter> JSChecker::CreateFocusWaiter(
     const std::initializer_list<base::StringPiece>& path) {
-  return std::make_unique<TestPredicateWaiter>(
+  auto result = std::make_unique<TestPredicateWaiter>(
       base::BindRepeating(&IsFocused, base::Unretained(web_contents_), path));
+  std::string description;
+  description.append(DescribePath(path)).append(" focused");
+  result->set_description(description);
+  return result;
 }
 
 std::unique_ptr<TestConditionWaiter> JSChecker::CreateWaiter(