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Creates the provider that will contain the buttons to bring up manual
fallbacks for autofill. Gated behind the manual fill flag.

Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: Ia36af25fc1e45f92e892b72a058b92d00c135b9c
Bug: 845472
Reviewed-on: https://chromium-review.googlesource.com/1135323
Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#575677}