Revert^2 "AnimatorSet sends pause/resume for seeked animators"

Fixed reentrancy issue.

Test: New tests for reentrancy. Ran old tests.

b4915629
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:1817208a10f56539f7fbc54ed20d5ff95d46c9af)
Merged-In: Idb83b101eee8f7ec38e5b0f7d685fd41695796f2
Change-Id: Idb83b101eee8f7ec38e5b0f7d685fd41695796f2
Fixes: 270709315