Add testcase for gbr config running on GTX1070 bots to test.py

Bug: skia:
Change-Id: I1f993100af712ce688dd21b5e510ffae4b587dce
Reviewed-on: https://skia-review.googlesource.com/66155
Commit-Queue: Brian Osman <brianosman@google.com>
Commit-Queue: Mike Klein <mtklein@chromium.org>
Reviewed-by: Mike Klein <mtklein@chromium.org>
2 files changed