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Currently upon collecting the inputs for the mutation on main thread, we
don't offset the current time by the start time which is incorrect.

Note:
The layout test animations/animationworklet/worklet-animation-currentTime.html
fails the release build because AnimationClock::currentTime is often
incorrectly ahead of rAF time so that when asking for the current time
in a rAF via getComputedStyle it returns obsolete result. This bug is
tracked by https://crbug.com/785940.

Bug: 905405
Change-Id: I0b7e293ae942e47b96eb8a7a2a8fefd94be66773
Reviewed-on: https://chromium-review.googlesource.com/c/1343558
Commit-Queue: Yi Gu <yigu@chromium.org>
Reviewed-by: Majid Valipour <majidvp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612238}