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TEST=Unit tests and an integration test Bug: https://github.com/dart-lang/coverage/issues/141 Change-Id: I84958091dc6f9753f5e9446bb3517a8099019981 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/222541 Reviewed-by: Ben Konyi <bkonyi@google.com> Commit-Queue: Liam Appelbe <liama@google.com>