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This change implement adding new entry points for the new Autofill Home.
Also it adds the required icons. Both of these changes are gated behind
a flag.

Bug: 854562
Change-Id: Iee5b029045b59875ad4d98bffb856ddc9945171a
Cq-Include-Trybots: luci.chromium.try:closure_compilation
Reviewed-on: https://chromium-review.googlesource.com/1111853
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#571079}