Return EXIT_FAILURE from run_perf_tests.py if any test failed Previosly EXIT_FAILURE was returned only for exceeding max_errors, which made Swarming erroneously believe that the task succeeded, even though some tests in it could have failed. Bug: angleproject:7498 Change-Id: I896fe97e7d24549202663351d5b61b206afbe6b1 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3762456 Commit-Queue: Roman Lavrov <romanl@google.com> Auto-Submit: Yuly Novikov <ynovikov@chromium.org> Reviewed-by: Roman Lavrov <romanl@google.com>