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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.