CC Animation: Port LayerUtilsGetAnimationBoundsTests to use animation timelines.
CC Animation: Port LayerUtilsGetAnimationBoundsTests to use animation timelines.

We preserve the old version of tests so we can fall back at any time.

BUG=394777
R=ajuma@chromium.org
R=vollick@chromium.org
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Review URL: https://codereview.chromium.org/1554063002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#367466}

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