Add synchronous transaction to wait for setInputWindow to complete (2/n)

Added InputWindowCommand syncInputWindows

This will allow the client to request SF to wait until setInputWindow
has completed on the InputDispatcher side.

Bug: 123041491
Test: Builds, no execution yet
Change-Id: Ibb5539455d20e4d612696ae7164ce84130bf91b4
5 files changed