SF: Lock access to InputWindowCommands

Fixes regression caused by ag/6260282.
Create a pending list of InputWindowCommands so that we can apply the commands without
holding on to the mStateLock to better align with the current and drawing state locking
strategy.

Bug: 124061013
Test: go/wm-smoke
Change-Id: I9ccec72da0d2139ca546e34df8e62c58c178d292