This will limit the total number of steps run in the test.
When using this argument we skip warmp & calibration.

Renames the prior --steps argument to --steps-per-trial.

Bug: b/172480147
Change-Id: Iae7cce26d66ca0bbdb21c1f511a6bfa246bd204e

Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2519404
Commit-Queue: Jamie Madill <jmadill@chromium.org>
Reviewed-by: Cody Northrop <cnorthrop@google.com>