New result types: Passed, Failed, TimedOut, Crashed, CompileFailed,
Skipped. They divide the results of tests more clearly.

Results are now immediately logged to the stdout once a test batch
completes.

Flags, with the exception of --gtest_filter now use "-" instead of "_".

Bug: angleproject:4817
Change-Id: I9616b23ef70026818e22126a251e1e2341de641d
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2340787
Commit-Queue: Manh Nguyen <nguyenmh@google.com>
Reviewed-by: Cody Northrop <cnorthrop@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>