2d2901b9bb
Discovered while attempting to migrate the file, split out for easier review. Change-Id: I1a3c56e0c277c79e9e71db89c8d5c8aa26891cc7 Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/403283 Reviewed-by: Konstantin Shcheglov <scheglov@google.com> Commit-Queue: Brian Wilkerson <brianwilkerson@google.com>