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This change adds a new TrackAutofilledElement() API to FormTracker,
allowing it to track elements that have been autofilled following a
user trigger.

Bug: 1140497
Change-Id: I4a772a01dfc33315be3110e17db1d169b834ead7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2517533
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Christoph Schwering <schwering@google.com>
Cr-Commit-Position: refs/heads/master@{#825392}