This will allow us to pass CQ since CQ requires isolated script output
args. We can also update this logic later to fail CQ if the golden
image check fails.

Bug: angleproject:4090
Bug: b/168049670
Change-Id: I81c5571e8742e641ebd8c9cbd8e1c89f583c725c
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2423212Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Cody Northrop <cnorthrop@google.com>
Commit-Queue: Jamie Madill <jmadill@chromium.org>