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Introduced the skeleton of the new autofill offer sync bridge.
Will add more to it in the following CLs.

The offer data and the wallet credit card data now will controlled by
the same toggle in the Chrome sync settings page. Therefore the sync
logic will be almost same. So reuse the current model type controller.

Bug: 1112095
Change-Id: I7464dde02b84f0a020f262c5453e8ac4a067edfe
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2365854Reviewed-by: Peter Kasting <pkasting@chromium.org>
Reviewed-by: Marc Treib <treib@chromium.org>
Reviewed-by: Matthias Körber <koerber@google.com>
Commit-Queue: Siyu An <siyua@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800561}