The SWA uses a temporary icon and is hidden behind a feature flag that
is disabled by default.

Bug: 1059779
Change-Id: I9cee9b2de42a49285a8ee5ba2877d6394a7ca5b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2348539
Commit-Queue: Jesse Schettler <jschettler@chromium.org>
Reviewed-by: Jimmy Gong <jimmyxgong@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Cr-Commit-Position: refs/heads/master@{#798367}