Also, add more tests to perf_test_unittest. Bug: webrtc:8566 Change-Id: I8864db7172fa207803d310c4a5fee4bf820a56bd Reviewed-on: https://webrtc-review.googlesource.com/25823 Reviewed-by: Fredrik Solenberg <solenberg@webrtc.org> Reviewed-by: Henrik Lundin <henrik.lundin@webrtc.org> Reviewed-by: Patrik Höglund <phoglund@webrtc.org> Commit-Queue: Edward Lemur <ehmaldonado@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20906}