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- Autogenerate Polymer 3 version of cr-link-row and tests
- Add to demo page

Bug: 965770
Change-Id: Ie375a47e04063909db61c360ced871f521f61985
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1789977Reviewed-by: Esmael Elmoslimany <aee@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#695345}