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As we develop the motion spec in pieces, the UI may regress until the
choreography is fully implemented. To prevent this, I added a constant
that we can use to gate changes that should not be enabled until
additional motion specs are also implemented.

This change is gated by that flag, so this change will not be visible
by default.

See bug for spec/demo.

Bug: b:111890130
Change-Id: I88ab63e4ba83e8210eacdd3dd8b3c45b305d0373
Reviewed-on: https://chromium-review.googlesource.com/1152208Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Commit-Queue: David Black <dmblack@google.com>
Cr-Commit-Position: refs/heads/master@{#579876}