This is a partial port of https://chromium-review.googlesource.com/1576022 Needed because recipes assume the flag exists. Example error (unnoticed until now because it's silently ignored): https://logs.chromium.org/logs/webrtc/buildbucket/cr-buildbucket.appspot.com/8911948550157608800/+/steps/lookup_GN_args/0/stdout Bug: chromium:955062 Change-Id: Id3707903dd5747c13bba05df76f799fb523a6faa Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/139248 Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org> Commit-Queue: Oleh Prypin <oprypin@webrtc.org> Cr-Commit-Position: refs/heads/master@{#28123}