Format perf_test.cc. This was missed when our git cl format protection was temporarily broken. A subsequent change caused the file to get fully formatted so this CL pulls that diff into a split change. Bug: angleproject:3630 Change-Id: I14ed53708783b38039e8fa64cb38837e25911893 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2103085 Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Jamie Madill <jmadill@chromium.org>