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The goal is to have the flutter test framework skip compilation of libraries it's already seen. See option 3 from this doc: https://docs.google.com/document/d/193DKN1DmbHdphhbC8RngdkSafHQGF2QEmf-qDxqSIrk/edit#heading=h.fn9090oeqrk3 Change-Id: Ia76bbb35df22dee6e9f8b32f90bbf2ef2fa18913 TEST=source_report_libraries_already_compiled_test.dart Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/321660 Reviewed-by: Ben Konyi <bkonyi@google.com> Commit-Queue: Liam Appelbe <liama@google.com>