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By spec [1], an animation effect is "in effect" if its active time is
not unresolved. However, if the effect is in the "after phase" and its
fill mode is neither "forwards" nor "both", its active time should be
unresolved which makes the effect not "in effect". Our cc logic doesn't
handle this case correctly.

This bug was not exposed because for regular animations we cancel the
animation on compositor in such scenario. But for worklet animations
that's not the case.

This patch adds the logic of calculating phases and the corresponding
active time based on the spec [2].

[1] https://drafts.csswg.org/web-animations/#in-effect
[2] https://drafts.csswg.org/web-animations/#active-time

Bug: 906675
Change-Id: I8872719432ede1eeeb1e7bdcf3b5f0312787c0d7
Reviewed-on: https://chromium-review.googlesource.com/c/1342598
Commit-Queue: Yi Gu <yigu@chromium.org>
Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Reviewed-by: Majid Valipour <majidvp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#614366}