No code changes in ANGLE, just a perf test runner fix.

BUG=angleproject:1155

Change-Id: If49c58da26f9224e09f292689b2d74f7e129a844
Reviewed-on: https://chromium-review.googlesource.com/633786Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Jamie Madill <jmadill@chromium.org>