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This is a reland of 5bf6f1b1

Original change's description:
> [Autofill Assistant] Bind the script tracker with the controller.
> 
> With this change, the controller tells the script tracker to run checks
> when necessary, calls the UI controller to choose a script to run and
> run the script that was chosen. The implementation of the UI controller
> for choosing the script is not included into this change.
> 
> Integration is preliminary, just to get something to get started until
> we have a usable UI to try it out. The UI part, implementing script
> selection, is missing from this change.
> 
> Change-Id: I867bec0e554dfdd87fc2f95e7c9088391621c5c9
> Bug: 806868
> Reviewed-on: https://chromium-review.googlesource.com/1194034
> Commit-Queue: Stephane Zermatten <szermatt@chromium.org>
> Reviewed-by: Ganggui Tang <gogerald@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#589135}

Bug: 806868
Change-Id: I40b66adca74162a1a41a47f1e065d2bf3aa225ed
Reviewed-on: https://chromium-review.googlesource.com/1209709
Commit-Queue: Stephane Zermatten <szermatt@chromium.org>
Reviewed-by: Ganggui Tang <gogerald@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589923}