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EffectProxy.localTime should accept undefined as its local time and treat
that as meaning that the keyframe effect is not in effect.


Note:
This is a partial fix. We still need to make sure that any applied effect
is cleared once localTime is set to undefined. This patch only ensures that
when the initial value is not set, or set to undefined the keyframe effect
is not applied.

Test: virtual/threaded/fast/animationworklet/worklet-animation-local-time-undefined.html

Bug: 870711
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: I2fdc716c331eb11a9b3eed524ac703f50a222a49
Reviewed-on: https://chromium-review.googlesource.com/1181935Reviewed-by: Stephen McGruer <smcgruer@chromium.org>
Reviewed-by: Yi Gu <yigu@chromium.org>
Commit-Queue: Majid Valipour <majidvp@chromium.org>
Cr-Commit-Position: refs/heads/master@{#585849}