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This will let the backend know whether the UI was shown to the user or
not.

Change-Id: I836fba76d322fc5989919323ccb4a50947a498e5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2056545
Commit-Queue: Clemens Arbesser <arbesser@google.com>
Commit-Queue: Sandro Maggi <sandromaggi@google.com>
Auto-Submit: Clemens Arbesser <arbesser@google.com>
Reviewed-by: Sandro Maggi <sandromaggi@google.com>
Cr-Commit-Position: refs/heads/master@{#741400}