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Add an observer for SingleWebsiteSettings. Implement the callbacks to
record metrics and tell the PageInfoController to update permissions.

Bug: 1077766
Change-Id: I2d4f9d234b66a312372cf68e5d9f9a2cd49af798
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2431665Reviewed-by: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Christian Dullweber <dullweber@chromium.org>
Commit-Queue: Ehimare Okoyomon <eokoyomon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812197}