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Currently the sync mechanism between cc and worklet is stateless meaning
that it sends a new copy of the world every sync cycle. This has the
benefit of keeping things very simple initially but it is not
necessarily very efficient.

This patch makes worklet animation stateful and adds the ability to
mutate only a subset of animations.

Bug: 843255
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I18e5d64d0145394fad739a70fa7d0e91bb0e4588
Reviewed-on: https://chromium-review.googlesource.com/1092413
Commit-Queue: Yi Gu <yigu@chromium.org>
Reviewed-by: Majid Valipour <majidvp@chromium.org>
Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567367}