Gold tests: add temporary logging of angledata hashes Should allow us to determine whether corruption happens between CAS and local files on bots or something's wrong with the test harness. Bug: angleproject:8307 Change-Id: I8a599777a38d7a1b5c56143eb8d02829895175a7 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4777836 Commit-Queue: Yuly Novikov <ynovikov@chromium.org> Reviewed-by: Yuly Novikov <ynovikov@chromium.org> Auto-Submit: Roman Lavrov <romanl@google.com>