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This is a reland of ae61a59a

I reproduced the build failure and added the missing include.

Original change's description:
> [Autofill Assistant] Added ForEach interaction.
>
> Note: this is an alternative solution for http://crrev/c/2235698
>
> This interaction executes a number of callbacks for the input loop value. This is intended to be used to inflate UI elements for client-only values, i.e., for values that the backend can't specify.
>
> Internally, ForEach loops are implemented by introducing the concept of callback contexts, which will change value and view lookup accordingly.
>
> In particular, callback contexts are used to automatically replace placeholders of the form ${i} in value and view identifiers (where 'i' is the loop identifier). This allows creating and referencing values and views with templated names, such as "created_view_${i}" and "value[${i}]".
>
> Bug: b/145043394
> Change-Id: I53089252fe1cc14b2b1fb74cfc56d7314bc4b37c
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2241975
> Commit-Queue: Clemens Arbesser <arbesser@google.com>
> Reviewed-by: Sandro Maggi <sandromaggi@google.com>
> Reviewed-by: Marian Fechete <marianfe@google.com>
> Cr-Commit-Position: refs/heads/master@{#780785}

Bug: b/145043394
Change-Id: I36b64f8d5a64f66f9e9081137a61a20c31ade8cd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2259847Reviewed-by: Mathias Carlen <mcarlen@chromium.org>
Commit-Queue: Clemens Arbesser <arbesser@google.com>
Cr-Commit-Position: refs/heads/master@{#781253}