[vm] Ensure we wait for the service-isolate to boot-up before communicating with it
[vm] Ensure we wait for the service-isolate to boot-up before communicating with it

Change-Id: Iaa099faa7cb560e25c90a045d518c6c07a4c54cd
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/111428
Reviewed-by: Clement Skau <495593248b6158163719b90dde8357b589c8e5d0@google.com>
Commit-Queue: Martin Kustermann <a35dd5b79fac84b2bb3b026a16b8becc55af5961@google.com>

dart-lang/sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-lang/sdk,dartino/dart-sdk,dartino/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-lang/sdk,dart-lang/sdk,dartino/dart-sdk,dart-lang/sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dartino/dart-sdk,dart-archive/dart-sdk,dart-lang/sdk,dart-lang/sdk,dart-archive/dart-sdk,dart-archive/dart-sdk