fddb38ecab
Allow dart code execution on mutator thread, do not require an isolate. It moves some states that was kept on an isolate to thread or isolate group. Bug: https://github.com/dart-lang/sdk/issues/54530 Bug: https://github.com/dart-lang/sdk/issues/56841 TEST=run_isolate_group_run_test CoreLibraryReviewExempt: only internal library is being updated Change-Id: I99df09e23954755387ea6230bfd166493d78e989 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/418503 Reviewed-by: Slava Egorov <vegorov@google.com> Reviewed-by: Ryan Macnak <rmacnak@google.com> Commit-Queue: Alexander Aprelev <aam@google.com>