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This is an implementation of the pattern proposal for Assistant Autofill
fallback handler.

Note that this does not solve the full range of issues we might have
with phone numbers. This works for static pages, where we know what the
expected input-format is.

This CL gives more flexibility in how to combine the values as an
expression. All available information is automatically extracted and
exposed for use.

This should go together with the backend CL: cl/293790701

Bug: b/147755494
Bug: b/147281090
Change-Id: I4f5e03fde7001767df92ba869d990b1804d421fa
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2030887
Commit-Queue: Sandro Maggi <sandromaggi@google.com>
Reviewed-by: Clemens Arbesser <arbesser@google.com>
Cr-Commit-Position: refs/heads/master@{#740304}