The Android tests require a valid output for the perf test
results. The smallest valid output is an empty array.

Bug: angleproject:3162
Change-Id: I1bf7602b02358d634347d587b406c0c2d7c838a2
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2254088
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Brian Sheedy <bsheedy@chromium.org>
Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>