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Autogenerate Polymer 3 version of cr_slider and tests.

Bug: chromium:858815
Test: browser tests
Change-Id: Ied01457e7b404400c277149539c9bbb6d630ad10
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2004184
Commit-Queue: Esmael Elmoslimany <aee@chromium.org>
Reviewed-by: Esmael Elmoslimany <aee@chromium.org>
Auto-Submit: David Munro <davidmunro@google.com>
Cr-Commit-Position: refs/heads/master@{#733412}