The ANGLE test harness is a harness around GoogleTest that provides
functionality similar to the Chromium test harness. It supports:

 * splitting a test set into shards
 * catching and reporting crashes and timeouts
 * outputting to the Chromium JSON test results format
 * multi-process execution

Unit tests are added in test_utils_unittest.cpp.

Bug: angleproject:3162
Change-Id: Idb15f113de8eb32db12bc93542de93b08d7c1447
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1478016
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>