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Currently all the effects of an animation are driven by the local time
of the first effect. Rather, they should be driven by the individual
local time.

This patch adds WorkletGroupEffectProxy to Animator and only initialize
it when necessary, i.e. animating group effects. Single effect animation
follows the existing logic which is not affected by this patch.

Bug: 894180
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_layout_tests_slimming_paint_v2;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I24a828d5afd07d94854683744e5d765af45c82c8
Reviewed-on: https://chromium-review.googlesource.com/c/1274192Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Reviewed-by: Jeremy Roman <jbroman@chromium.org>
Reviewed-by: Majid Valipour <majidvp@chromium.org>
Commit-Queue: Yi Gu <yigu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600073}