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This CL introduces a new class, AutofillDropdownFooter, to represent the
footer in the UI Refresh of the Autofill dropdown. This class is backed
by a new XML layout.

In addition, the AutofillPopup receives new logic separating out the
footer items from the rest of the suggestions, and passing them along
to an instance of the new class, if and only if the UI refresh is in
use.

Bug: 874077
Change-Id: Ia6b28633afabc3c418908efcdde77a52af6fdb0a
Reviewed-on: https://chromium-review.googlesource.com/c/1255886
Commit-Queue: Tommy Martino <tmartino@chromium.org>
Reviewed-by: Fabio Tirelo <ftirelo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595959}