* 31e6861d4 Reland "Compile libcxx and libcxxabi for Android (#6886)" (flutter/engine#7160) * 648b844b7 Roll buildroot to 4cb5a74c9612b71b917997f46e97da6d1051eab4 (flutter/engine#7194) * abb1d3a6c Roll buildroot to 8e538639660413490ea9261eee84864005e240f4 (flutter/engine#7195)
Dart SDK dependency
The bin/internal/engine.version file controls which version of the Flutter engine to use.
The file contains the commit hash of a commit in the https://github.com/flutter/engine repository.
That hash must have successfully been compiled on https://build.chromium.org/p/client.flutter/ and had its artifacts (the binaries that run on Android and iOS, the compiler, etc) successfully uploaded to Google Cloud Storage.
The /bin/internal/engine.merge_method file controls how we merge a pull
request created by the engine auto-roller. If it's squash, there's only one
commit for a pull request no matter how many engine commits there are inside
that pull request. If it's rebase, the number of commits in the framework is
equal to the number of engine commits in the pull request. The latter method
makes it easier to detect regressions but costs more test resources.