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Impeller back ends may hold resources (such as Vulkan command pools) in thread-local storage so they can be reused during a series of operations. These resources must be freed when they are no longer useful. Fixes https://github.com/flutter/flutter/issues/172068
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.