Needed because swarming adds --isolated-script-test-output and --isolated-script-test-perf-output See for example: https://chromium-swarm.appspot.com/task?id=39006c763bebf710 No-Try: true Bug: chromium:755660 Change-Id: Iff9fb3441200f760c511a67211fbc4a1272717b4 Reviewed-on: https://webrtc-review.googlesource.com/6362 Reviewed-by: Henrik Kjellander <kjellander@webrtc.org> Reviewed-by: Oleh Prypin <oprypin@webrtc.org> Commit-Queue: Edward Lemur <ehmaldonado@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20146}