Using `tools/test.py -cdart2js` fails.

[lrhn]

I use tools/test.py -cdar2js to test web code.
That currently gives me an error containing the following stack header when trying to run a test (tests/lib/async/stream_periodic3_test.dart):

Deobfuscated error and stack:

    at wrapException                     org-dartlang-sdk:///lib/_intern
al/js_runtime/lib/js_helper.dart 1209:19
    at _Platform._operatingSystem        org-dartlang-sdk:///lib/_intern
al/js_runtime/lib/io_patch.dart 243:5
    at _Platform.operatingSystem         org-dartlang-sdk:///lib/io/plat
form_impl.dart 56:40
    at Stopwatch._frequency              org-dartlang-sdk:///lib/io/plat
form.dart 83:44

That suggests that something is compiled using VM library code, because the web implementation of Stopwatch does not reference Platform.

If I explicitly write -ndart2js-production-linux-d8 or a similar standard configuration string, compilation works.