This is a reland of https://github.com/flutter/flutter/pull/164748, which was reverted here: https://github.com/flutter/flutter/pull/165350 It was reverted due to some issues in the flutter packages roller: https://github.com/flutter/flutter/issues/165347 The unit test in flutter/packages was modified to be more deterministic and less affected by minor timing differences: https://github.com/flutter/packages/pull/8920 So this is basically being relanded without any significant changes, since the downstream tests have been fixed.
buildroot
Build environment for the Flutter engine
This repository is used by the flutter/engine repository. For instructions on how to use it, see that repository's CONTRIBUTING.md file.
To update your checkout to use the latest buildroot, run gclient sync.
To submit patches to this buildroot repository, create a branch, push to that branch, then submit a PR on GitHub for that branch.
To point the engine to a new version of buildroot after your patch is merged, update the buildroot hash in the engine's DEPS file.