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With this change we will be able to show any app icons just by appending
their app id to chrome://app-icons. If we don't do this type of
whitelisting, the only other way we can pass the icons to the
Kiosk Next Home is to encode their images and pass them through mojo.

That other approach was implented here but it's much more cumbersome:
http://crrev/c/1539156.

Bug: 927809
Change-Id: Id1b63b3959d335dabcccd6d8a743e2e6e825ef01
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1534414Reviewed-by: Michael Giuffrida <michaelpg@chromium.org>
Commit-Queue: Lucas Tenório <ltenorio@chromium.org>
Cr-Commit-Position: refs/heads/master@{#644673}