Show it can make vp9 tests cleaner too. Bug: None Change-Id: I8333a61dec1ef90ade9faffea94e1555ccbfcfaa Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/177013 Commit-Queue: Danil Chapovalov <danilchap@webrtc.org> Reviewed-by: Philip Eliasson <philipel@webrtc.org> Cr-Commit-Position: refs/heads/master@{#31523}