Added back helper file accidentally deleted during test block 219 migration.

tests/lib_strong/lib_strong.status

 # Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # Skip entire suite if not running in strong mode.
 [ ! $strong ]
 *: SkipByDesign
 
 # Skip tests that are not yet strong-mode clean.
 [ $strong ]
@@ skipping 36 matching lines @@
 html/keyboard_event_test: Skip
 html/mutationobserver_test: Skip
 html/postmessage_structured_test: Skip
 html/resource_http_test: Skip
 html/transferables_test: Skip
 html/webgl_1_test: Skip
 html/wrapping_collections_test: Skip
 math/min_max_test: Skip
 mirrors/abstract_class_test: Skip
 mirrors/abstract_test: Skip
-mirrors/constructors_test: Skip
-mirrors/dart2js_mirrors_test: Skip
-mirrors/deferred_type_test: Skip
-mirrors/delegate_call_through_getter_test: Skip
-mirrors/delegate_class_test: Skip
-mirrors/delegate_function_invocation_test: Skip
-mirrors/delegate_library_test: Skip
-mirrors/delegate_test: Skip
-mirrors/enum_test: Skip
+mirrors/circular_factory_redirection_test: Skip
+mirrors/class_declarations_test: Skip
+mirrors/closures_test: Skip
 mirrors/fake_function_without_call_test: Skip
 mirrors/generic_bounded_by_type_parameter_test: Skip
 mirrors/generic_bounded_test: Skip
 mirrors/generic_class_declaration_test: Skip
 mirrors/generic_f_bounded_mixin_application_test: Skip
 mirrors/generic_interface_test: Skip
 mirrors/generics_test: Skip
 mirrors/get_symbol_name_no_such_method_test: Skip
 mirrors/immutable_collections_test: Skip
 mirrors/inference_and_no_such_method_test: Skip
@@ skipping 72 matching lines @@
 typed_data/float32x4_test: Skip
 typed_data/float64x2_functional_test: Skip
 typed_data/int32x4_test: Skip
 html/custom/created_callback_test: CompileTimeError # Issue 28969
 html/custom/document_register_basic_test: CompileTimeError # Issue 28969
 html/custom/document_register_type_extensions_test: CompileTimeError # Issue 28969
 html/custom/element_upgrade_test: CompileTimeError # Issue 28969
 html/js_typed_interop_default_arg_test/default_value: MissingCompileTimeError # Issue 28969
 
 [ $compiler == dart2analyzer && $strong ]
-mirrors/deferred_mirrors_metadata_test: StaticWarning # Issue 28969
 html/debugger_test: CompileTimeError # Issue 28969
 
 # TODO(29919): HTML tests are not supported on dartdevc in test.dart yet.
 [ $compiler == dartdevc ]
 html/deferred_multi_app_htmltest: Skip # Issue 29919
 html/no_linked_scripts_htmltest: Skip # Issue 29919
 html/scripts_htmltest: Skip # Issue 29919
 html/two_scripts_htmltest: Skip # Issue 29919
 html/custom/attribute_changed_callback_test: Crash # Issue 29922
 html/custom/constructor_calls_created_synchronously_test: Crash # Issue 29922
@@ skipping 39 matching lines @@
 html/media_stream_test: RuntimeError # Issue 29922
 html/mediasource_test: RuntimeError # Issue 29922
 html/typing_test: RuntimeError # Issue 29922
 html/websql_test/functional: RuntimeError # Issue 29922
 html/worker_api_test: RuntimeError # Issue 29922
 html/xhr_cross_origin_test/functional: RuntimeError # Issue 29922
 math/double_pow_test: RuntimeError # Issue 29922
 math/low_test: RuntimeError # Issue 29922
 math/random_big_test: RuntimeError # Issue 29922
 mirrors/accessor_cache_overflow_test: RuntimeError # Issue 29922
-mirrors/constructor_private_name_test: RuntimeError # Issue 29922
-mirrors/declarations_type_test: RuntimeError # Issue 29922
-mirrors/deferred_mirrors_metadata_test: RuntimeError # Issue 29922
-mirrors/deferred_mirrors_metatarget_test: RuntimeError # Issue 29922
-mirrors/deferred_mirrors_update_test: RuntimeError # Issue 29922
-mirrors/empty_test: RuntimeError # Issue 29922
-mirrors/equality_test: RuntimeError # Issue 29922
+mirrors/basic_types_in_dart_core_test: RuntimeError # Issue 29922
+mirrors/class_mirror_location_test: RuntimeError # Issue 29922
+mirrors/class_mirror_type_variables_test: RuntimeError # Issue 29922
+mirrors/closurization_equivalence_test: RuntimeError # Issue 29922
+mirrors/constructor_kinds_test/01: RuntimeError # Issue 29922
 mirrors/fake_function_with_call_test: RuntimeError # Issue 29922
 mirrors/field_metadata2_test: RuntimeError # Issue 29922
 mirrors/field_type_test: RuntimeError # Issue 29922
 mirrors/function_type_mirror_test: RuntimeError # Issue 29922
 mirrors/generic_f_bounded_test/01: RuntimeError # Issue 29922
 mirrors/generic_f_bounded_test/none: RuntimeError # Issue 29922
 mirrors/generic_function_typedef_test: RuntimeError # Issue 29922
 mirrors/generic_local_function_test: RuntimeError # Issue 29922
 mirrors/generic_mixin_applications_test: RuntimeError # Issue 29922
 mirrors/generic_mixin_test: RuntimeError # Issue 29922
@@ skipping 110 matching lines @@
 html/touchevent_test: RuntimeError # Issue 29922
 
 [ $compiler == dartdevc && $runtime == drt ]
 html/svg_test: RuntimeError # Issue 29922
 math/math_test: RuntimeError # Issue 29922
 math/math2_test: RuntimeError # Issue 29922
 
 [ $compiler == dartdevc && $system == windows ]
 convert/json_pretty_test: RuntimeError # Issue 30336
 html/xhr_test/xhr: Skip # Times out. Issue 21527