GitLab

The media playback test was recently added:
https://codereview.chromium.org/1431193005/

and requires specific switches:
* local file access required to load test media
* cma pipeline explicitly enabled in order to test that
* cast ozone platform enabled in order to test overlay frames

These tests have been failing on internal infrastructure (tot build)
because the switches were only configured in testing/buildbot (for
running on Chromium bots).

BUG=

Review URL: https://codereview.chromium.org/1466633004

Cr-Commit-Position: refs/heads/master@{#361134}