New script for using buildbots for nightly tests.

This script could eventually replace the current test_toolchains.py
script.  Instead of downloading and building ChromeOS locally, it
launches a buildbot to build ChromeOS with the latest mobile
toolchain compiler.  It then downloads the trybot image (and the
corresponding vanilla image), generates the crosperf experiment file,
and launches crosperf.

I have been running this as a second cron job on chrotomation2,
running daisy tests, and it has been working just fine.

BUG=None
TEST=Ran in cron jobs on chrotomation2.

Change-Id: I3b17d0373e2fae359fc8f4e0188dcec2943c7b71
Reviewed-on: https://chrome-internal-review.googlesource.com/187735
Reviewed-by: Caroline Tice <cmtice@google.com>
Trybot-Ready: Caroline Tice <cmtice@google.com>
Tested-by: Caroline Tice <cmtice@google.com>
Commit-Queue: Caroline Tice <cmtice@google.com>
2 files changed