This seems to be Clang-only.

Change-Id: I4276a29e3d1575bd47d58d819ed3223b2c66838a
Reviewed-on: https://chromium-review.googlesource.com/321820Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Tested-by: Jamie Madill <jmadill@chromium.org>