Currently isolated output directory is created in flags_compatibility.py script.
This doesn't work for android swarming tasks because this script isn't called.
Bug: webrtc:11895
Change-Id: I8b8f01850d6e5970292b524d104314eef7ab17be
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/185883
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Artem Titov <titovartem@webrtc.org>
Commit-Queue: Jeremy Leconte <jleconte@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32236}