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When an ItemTag  is set on the AutofillBarItem, show an IPH Bubble
displaying the ItemTag text with an arrow pointing to the startIcon.

The item tag IPH bubble is an educational bubble that explains what
the offer icon in a payments chip means.
We'd like to show it to the user once(or maybe 3 times at max) and
then never show it again.
When multiple chips have the item tag set, we want to show the
IPH bubble only for the first one.

Implementation: https://screenshot.googleplex.com/BhxGYNvfWHBckfV
(Note: the Visa icon will be replaced by the offer icon)

Bug: 1156916
Change-Id: Ieaa441b1f5474d11b41004b6326e0144dcd272a6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2600266
Commit-Queue: Siddharth Shah <siashah@chromium.org>
Reviewed-by: Theresa  <twellington@chromium.org>
Reviewed-by: Friedrich [CET] <fhorschig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#842218}