dc3cf83bb6
This allows the embedder to control the degree of parallelism and thread priorities. TEST=engine Bug: https://github.com/dart-lang/sdk/issues/44228 Change-Id: I4e8430749fcfbcbfc221c3733ee27ccbe6bcc1ae Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/215941 Reviewed-by: Kaushik Iska <kaushikiska@google.com> Reviewed-by: Siva Annamalai <asiva@google.com> Commit-Queue: Ryan Macnak <rmacnak@google.com>