Skip front_end tests on jsshell due to #26103.

pkg/pkg.status

 # Copyright (c) 2012, 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.
 
 # Don't run any test-like files that show up in packages directories. It
 # shouldn't be necessary to run "pub install" in these packages, but if you do
 # it shouldn't break the tests.
 */packages/*/*: Skip
 */*/packages/*/*: Skip
 */*/*/packages/*/*: Skip
@@ skipping 53 matching lines @@
 analyzer/test/*: Skip # Issue 26813
 analyzer/tool/*: Skip # Issue 26813
 analysis_server/test/*: Skip # Issue 26813
 
 [ $compiler == dart2js && $checked ]
 crypto/test/base64_test: Slow, Pass
 
 [ $runtime == jsshell ]
 async/test/stream_zip_test: RuntimeError, OK # Issue 26103. Timers are not supported.
 lookup_map/test/lookup_map_test: RuntimeError, OK # Issue 26103. Timers are not supported.
+front_end/test/*: RuntimeError, OK # Issue 26103. Timers are not supported.
 
 [ $compiler == dart2js && $runtime == drt ]
 async/test/stream_zip_test: RuntimeError, Pass # Issue 18548
 
 [ $compiler == dart2js && ($runtime == chrome || $runtime == ff) ]
 collection/test/unmodifiable_collection_test: SkipSlow # Times out. Issue 22050
 async/test/stream_zip_test: SkipSlow # Times out. Issue 22050
 
 [ $runtime == ie10 ]
 analyzer/test/generated/java_core_test: Pass, Timeout # Issue 19747
@@ skipping 99 matching lines @@
 analyzer/test/src/task/strong/checker_test: Crash # Issue 24485
 analyzer/test/src/task/strong/inferred_type_test: Crash # Issue 24485
 analyzer/test/src/task/strong_mode_test: Crash # Issue 24485
 analyzer/test/src/task/yaml_test: Crash # Issue 24485
 
 [ $noopt || $runtime == dart_precompiled || $runtime == dart_app ]
 *: SkipByDesign # The pkg test framework imports dart:mirrors.
 
 [ $compiler == dart2js && $cps_ir && $checked ]
 *: Skip # `assert` not implemented, about 75% tests crash