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This change implements permissions prompts for the "idle-detection"
permission on desktop and Android as well as the necessary site settings
UI.

Bug: 878979
Change-Id: If5e91bf6fe19ba93c4439ff4eec7fee0ef5fc1d8
TBR: hkamila@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2360485
Commit-Queue: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Finnur Thorarinsson <finnur@chromium.org>
Reviewed-by: Theodore Olsauskas-Warren <sauski@google.com>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807655}