GitLab

Makes the isolated script test wrapper script know that
metrics_python_tests is a typ based test suite, so that it passes the
proper command line argument to it.

Bug: 533481
Change-Id: Ifd45f947409989174e1da046be6a8342931f82eb
Reviewed-on: https://chromium-review.googlesource.com/1109400Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Stephen Martinis <martiniss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569423}