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Grant screen access to web application and revoke it depending on
whether a web application can be shown on the screen. Only show a web
application when screen access has been granted.

Bug: internal b/112164384
Test: manual
Change-Id: I654f3a69395c1a84e33f38a84d52ba45060d96e2
Reviewed-on: https://chromium-review.googlesource.com/1164641Reviewed-by: Kenneth MacKay <kmackay@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Commit-Queue: James West <jameswest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#582975}