GitLab

This is imported by settings_animated_pages, which will be migrated
to Polymer 3 in a followup.

Bug: 1026426
Change-Id: If0808e2b900f869a6bc317b509be502bf5b836bb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036928Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#738315}