Avoid calling syncInputTransactions within wm lock

It is possible to block wm lock for 5 seconds, waiting for sync
input transaction.

Also avoid move focus to the adjacent embedded window when the
adjacent activity is not yet visible.

Bug: 436971500
Test: wm presubmit
Flag: EXEMPT bugfix
Change-Id: I70992c1d0d22d400fb83d05f32cb27a5559bc69d