Merge changes I7261cf87,Icabfcf47,I09e6b032,I252cf139,If85ade73, ... into nyc-dev

am: a51388d653

* commit 'a51388d6536bd57c2bbcf18e84d87763d388dbf7':
  Revert "Death to synchronous transactions (2/2)"
  Fix a few weird state issues from race-conditions
  Fix lifecycle bug in when calling positionTask
  Animation fixes when task is not resumed
  Keep stack from mReuseTask
  Final fixes for growing recents transition

Change-Id: I7f6ec0e8fa76b12229c4e7b53915eb152f1bfcfb