GitLab

Previously CompositorTimeline was updated on Animation level which
introduced a reverse dependency. This patch moves the update logic up
to AnimationTimeline level to fix this issue.

Bug: 921031
Change-Id: Iaaa92686003c741cad424eb9867a0993193c05c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2225853Reviewed-by: Majid Valipour <majidvp@chromium.org>
Commit-Queue: Yi Gu <yigu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774351}