Fix how variance experiment is enabled in dart2js_extra test The test runner has logic to merge experiments from shared-options, but not from dart2js-options. Change-Id: I73fd0f4440edb11750b2d9ee78746bd13d260869 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/140200 Reviewed-by: Mayank Patke <fishythefish@google.com> Commit-Queue: Sigmund Cherem <sigmund@google.com>
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