Trace Tests: Scale results based on frames in capture. This now reports averaged time per frame instead of per "step". Scores in general will be divided by 11. Results still reported in nanoseconds. Bug: angleproject:4920 Change-Id: I6f9dca75885cce358c3c7d1e871441969d8aa3d3 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2334095 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Cody Northrop <cnorthrop@google.com> Commit-Queue: Jamie Madill <jmadill@chromium.org>