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As part of the privacy settings redesign, the capability to display
recently changed permissions to the user is required. This CL introduces
the a handler to enable querying for this information from JS.

The GetRecentSitePermissions provides the most recent permissions
changes grouped by at most N unique origin/[incognito, normal]
combinations.

Existing functionality which is reused from the GetAllSites handler
is also refactored out.

Bug: 1032584
Change-Id: I885c859d455bc49d8ec9d91bf3101cf337c4ae51
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2002577
Commit-Queue: Theodore Olsauskas-Warren <sauski@google.com>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#739027}