A puppeteer test that runs karma-like tests

Change-Id: Iedd98c03ba9d56b64390ffea23a50c945be9aff3
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/305557
Commit-Queue: Nathaniel Nifong <nifong@google.com>
Reviewed-by: Elliot Evans <elliotevans@google.com>
Reviewed-by: Kevin Lubick <kjlubick@google.com>
12 files changed