js-interop test is flaky now.

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 203 matching lines @@
 polymer_expressions/*: Pass, RuntimeError # Issue 19265
 template_binding/test/template_binding_test: Pass, RuntimeError # Issue 19265
 polymer/test/event_handlers_test: Pass, Timeout # Issue 19327
 analyzer/test/generated/java_core_test: Pass, Timeout # Issue 19747
 
 [ $runtime == safari || $runtime == safarimobilesim ]
 # Unexplained errors only occuring on Safari.
 typed_data/test/typed_buffers_test: RuntimeError
 
 [ $runtime == safari ]
-polymer/test/js_interop_test: RuntimeError # Issue 20075
+polymer/test/js_interop_test: Pass, RuntimeError # Issue 20075
 
 [ $runtime == safari || $ie ]
 polymer/test/two_way_bind_test: Pass, RuntimeError # Issue 20075
 
 # Skip browser-specific tests on VM
 [ $runtime == vm ]
 path/test/browser_test: Fail, OK # Uses dart:html
 intl/test/find_default_locale_browser_test: Skip
 intl/test/date_time_format_http_request_test: Skip
 third_party/angular_tests/vm_test: Fail # Uses removed APIs. See issue 18733.
@@ skipping 209 matching lines @@
 http/test/multipart_test: Fail
 http/test/request_test: Fail
 http/test/response_test: Fail
 oauth2/test/authorization_code_grant_test: Fail
 oauth2/test/client_test: Fail
 oauth2/test/credentials_test: Fail
 oauth2/test/handle_access_token_response_test: Fail
 
 [ $runtime == drt ]
 http/test/html/client_test: Skip # Issue 18566