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This patch introduces a new polymer element for chrome OS that is
responsible for running lottie animations on a third party player on a
worker thread.

Added unit tests.

Bug: 976057
Change-Id: I32323d758e432d7506fed6d9346b019cd9234653
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1725322
Commit-Queue: Malay Keshav <malaykeshav@chromium.org>
Reviewed-by: Dan Beam <dbeam@chromium.org>
Reviewed-by: Steven Bennetts <stevenjb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#688677}