metrics_python_tests: Pass correct filter argument

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/1109400
Reviewed-by: Dirk Pranke <[email protected]>
Reviewed-by: Kenneth Russell <[email protected]>
Commit-Queue: Stephen Martinis <[email protected]>
Cr-Commit-Position: refs/heads/master@{#569423}
1 file changed