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Previously any time any worklet animations were run, all worklet
animations are run regardless of whether their input time has changed.
This avoids running animations which haven't changed and reuses their
value from the previous animation call.

Note that worklet animations that are being removed still get mutated
even though the input time doesn't change.

Bug: 791279
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I212d1da620899ab3f02fceae07eda092d2b39fdb
Reviewed-on: https://chromium-review.googlesource.com/1101655
Commit-Queue: Yi Gu <yigu@chromium.org>
Reviewed-by: Robert Flack <flackr@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567712}