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For extensions that only request access to specific sites (e.g., an
extension that only requests access to google.com and example.com),
display a toggle-able list in the chrome://extensions page rather than
a free-form entry field. The ability to grant all requested sites
still exists via a "main" toggle, and disabling this allows the user to
toggle individual sites. This logic is contained in the new
HostPermissionsToggleList custom element.

This is a usability improvement over the free-form entry, since with
free-form entry it's not immediately obvious what the possible options
are.

Free-form entry is still used for extensions that request all sites (or
all-sites like patterns, such as https://*.com), since (almost) any site
entered is valid.

Update and add tests for the same.

Bug: 891803

Cq-Include-Trybots: luci.chromium.try:closure_compilation
Change-Id: I99112966d323c403603d5f21c28ae33be8e506f0
Reviewed-on: https://chromium-review.googlesource.com/c/1284696
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605150}