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Simplifies the process of running the GPU pixel tests locally by making
them attempt to automatically detect if they are being run on a
workstation instead of on a bot, as well as automatically determining
the build revision. This removes the need to pass either --local-run
or --build-revision when running locally.

Bug: 1013358
Change-Id: Ie3fd2171d94fa4452b7f334c7bcdd5ab42705414
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1860677Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Brian Sheedy <bsheedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705704}