This will make the test runner early exit after a certain count
of failures. This will prevent the bots from running tens of
thousands of tests when the whole test run is corrupt.

Bug: angleproject:6075
Change-Id: I8f5c19ea694a5ad3a5d5df1429d2ba4b1fe868e3
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2976179
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>