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Add a Tast mode to cros VM test runner.

Tast is a new suite of tests. It's invoked via "local_test_runner" in
the VM. You pass it a set of test names and it'll exercise some test
cases. We shouldn't use much more than the browser flavored ones.

Bug: 876587
Change-Id: I1d6ae9b6b5a929daadb6c12751cb0cd632a24d95
Reviewed-on: https://chromium-review.googlesource.com/1237673
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594075}