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Reverts: flutter/flutter#173114
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Initiated by: jtmcdole
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Reason for reverting: there is still another problem with the merge
queue causing the content hash to be different:
git revision: e13dd5384cc0db576291c2925852879f1111f284
actual hash: 4b6f7b0f9849efaa59f515c8e95f3f27a6eb2ffb
hash in the queue? 9e5b2eef4ba79b15b4f80dbba812d199d262366f
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Original PR Author: jtmcdole
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Reviewed By: {matanlurey, chingjun}
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This change reverts the following previous change:
The content hash doesn't exist for local engine changes, except for on
CI. If we detect we're on a branch with committed or uncommitted changes
to engine files; use "master".
towards #171790
re-land attempt for #172792 with the following changes:
1. content_aware_hash.(ps1|sh) now consider multiple branches to choose
between HEAD and merge-base.
2. content_aware_hash_test.dart updated for these new requirements
3. content_aware_hash_test.dart allows for forcing powershell on mac for
testing
4. updated docs/tool/Engine-artifacts.md documentation.
## Pre-launch Checklist
- [x] I read the [Contributor Guide] and followed the process outlined
there for submitting PRs.
- [x] I read the [Tree Hygiene] wiki page, which explains my
responsibilities.
- [x] I read and followed the [Flutter Style Guide], including [Features
we expect every widget to implement].
- [x] I signed the [CLA].
- [x] I listed at least one issue that this PR fixes in the description
above.
- [x] I updated/added relevant documentation (doc comments with `///`).
- [x] I added new tests to check the change I am making, or this PR is
[test-exempt].
- [ ] I followed the [breaking change policy] and added [Data Driven
Fixes] where supported.
- [x] All existing and new tests are passing.
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Co-authored-by: auto-submit[bot] <flutter-engprod-team@google.com>