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E.g. when .packages changes, we want to re-scan the context for new available libraries. We also don't want to discard all context, and resend everything. R=brianwilkerson@google.com Bug: https://github.com/Dart-Code/Dart-Code/issues/1723 Change-Id: I19ee71c1d021fb9bcda9d02d86b7cbb078704aa7 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/103320 Reviewed-by: Brian Wilkerson <brianwilkerson@google.com> Commit-Queue: Konstantin Shcheglov <scheglov@google.com>