These extensions are required by the passthrough command decoder.

BUG=602737

Change-Id: Ifd04fca27ae35b30e4c8ab458904530e3dd44377
Reviewed-on: https://chromium-review.googlesource.com/441204Reviewed-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Commit-Queue: Geoff Lang <geofflang@chromium.org>