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This change adds UKMs for Touch To Fill User Actions.

Launch Bug: https://crbug.com/1008937
Collection Review: go/touch-to-fill-ukm-collection-review

Bug: 1020996
Change-Id: Ie2c4c731e2f53d879b9d5df73ab4e4465b21b228
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1897932
Commit-Queue: Jan Wilken Dörrie <jdoerrie@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Reviewed-by: Friedrich [CET] <fhorschig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714844}