GitLab

This cl causes the bindings generator to automatically collect UKM when
these attributes are accessed. This will be used to analyze how much
entropy leaked by this API can be used for cross-site tracking.

Change-Id: I25fddca92048669e25674070b0f619368270346c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2424073Reviewed-by: Kinuko Yasuda <kinuko@chromium.org>
Commit-Queue: Chris Fredrickson <cfredric@google.com>
Cr-Commit-Position: refs/heads/master@{#809753}