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This stops UI animation and video from freezing during the animation.
Also move some constants to test-accessible location and delete the
duplicates in the tests.

Bug: 554993
Change-Id: Ie4585fa405b32e8bdae984d5a4ffac700c1375ab
Reviewed-on: https://chromium-review.googlesource.com/1166169Reviewed-by: Mark Mentovai <mark@chromium.org>
Commit-Queue: Sidney San Martín <sdy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583361}