Batch capture run + change how results are logged Before, the run stages of tests in a batch were run separately by multiple subprocesses. Now the run stages of tests in a batch are batched together and run by a single subprocess. Changes how results are logged. Tests in a batch are logged together. Within a batch, tests that fail at the same stage are also logged together. Bug: angleproject:4817 Change-Id: Ie3f992c081de914f1f1f521bec2d72f06ccca238 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2331738 Commit-Queue: Manh Nguyen <nguyenmh@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Cody Northrop <cnorthrop@google.com>