Hackathon fixes

Merge upstream pull requests:
- Decompress local files when running tests
- Support url tests and tags param splitting

Change-Id: Ibdf392d7c33b951e2f622c2cbfb875ac1777488f
Reviewed-on: https://chromium-review.googlesource.com/c/external/github.com/WebKit/JetStream/+/7035653
Reviewed-by: Marja Hölttä <[email protected]>
5 files changed