This makes it easier to add new test cases without modifying the actual test class. Bug: None Change-Id: I48e4f14e26cd6610678ffb07ce9fd56e6bc1ac4e Reviewed-on: https://webrtc-review.googlesource.com/69600 Commit-Queue: Kári Helgason <kthelgason@webrtc.org> Reviewed-by: Rasmus Brandt <brandtr@webrtc.org> Cr-Commit-Position: refs/heads/master@{#22840}