[perf] Fix for plot-simple-sk.
[perf] Fix for plot-simple-sk.

Follow up from https://skia-review.googlesource.com/c/buildbot/+/298508

Change-Id: I097e096496188ff015039ea5d945ada971217102
Reviewed-on: https://skia-review.googlesource.com/c/buildbot/+/299284
Reviewed-by: Leandro Lovisolo <f558143c2568be8d55575d13f30a1fc5cb8009d5@google.com>
Commit-Queue: Joe Gregorio <b9cf2471ff6d33504cafe8e6f356b732b2cadced@google.com>

google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot,google/skia-buildbot