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This protocol will be used to support "Evaluate Expression" and "Watch" window features in IDEs. Change-Id: Ibde1e88507a66d8c487836a227dfeb13ffd77d9d Reviewed-on: https://dart-review.googlesource.com/54629 Commit-Queue: Konstantin Shcheglov <scheglov@google.com> Reviewed-by: Jacob Richman <jacobr@google.com> Reviewed-by: Brian Wilkerson <brianwilkerson@google.com>