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This is in preparation for https://dart-review.googlesource.com/c/sdk/+/397164 Pub insists that packages have their code in 'lib/'. TEST=ci Change-Id: I416204bec5ef7948bcf93c39f50fb018574b775f Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/405140 Reviewed-by: Tess Strickland <sstrickl@google.com>