Recycle tasks that are split when split select anim complete for reuse

Re-land this CL after memory leak and performance regression for time were fixed.

Change-Id: I726a5d7e970869e54e9ece736f97802b8d01b02e
Fix: 376428479
Fix: 383033231
Bug: 381352866
Flag: EXEMPT bugfix
Test: Manual verification of heap dumps