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This is a reland of 04f43afb

Original change's description:
> [Autofill Assistant] Displays the difference in Details if there is any.
>
> If there is a difference between current and new details it's
> highlighted and two chips are displayed; to allow move forward or
> go back (which closes CCT).
>
> Screenshot: https://screenshot.googleplex.com/kOoC3B1frUp
>
> Bug: 806868
> Change-Id: I95ff09c379398d5a5858aa3947d4c578f39b14c9
> Reviewed-on: https://chromium-review.googlesource.com/c/1335941
> Commit-Queue: Lukasz Suder <lsuder@chromium.org>
> Reviewed-by: Stephane Zermatten <szermatt@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#608759}

Bug: 806868
Change-Id: I419ac2bb513f6fdd496fba40162c92b839952df9
Reviewed-on: https://chromium-review.googlesource.com/c/1340329Reviewed-by: Stephane Zermatten <szermatt@chromium.org>
Commit-Queue: Lukasz Suder <lsuder@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608830}