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towards #171790 Use the content aware hash when downloading engine artifacts. These are currently produced when changes to DEPs, engine/, or the release file are changed in a not-seen-before way. We can eventually remove `engine.version` being tracked in release branches as an optimization. `FLUTTER_PREBUILT_ENGINE_VERSION` will stay for overriding the engine.version for testing. Though Cocoon does not need to actually set it for framework only PRs anymore.
Flutter SDK dependency versions
The files in this directory specifies pinned versions of various dependencies of the flutter SDK.
The bin/internal/engine.version file controls where to find compiled artifacts
of the engine. These artifacts are compiled in the Merge Queue for every commit
in the flutter repository.
The bin/internal/flutter_packages.version file specifies the version
of the flutter/packages repository to be used for testing. The
flutter/packages repository isn't an upstream dependency of
flutter/flutter; it is only used as part of the test suite for
verification, and the pinned version here makes sure that tests are
deterministic at each flutter/flutter commit.