Flip blast sync flag

This enables blast sync when there's a request for a synchronized
transaction. This doesn't include enabling blast or blast sync for
SurfaceView

Test: go/wm-smoke
Test: split screen and pip with SurfaceView and secure content
Bug: 175229445
Change-Id: I01748a29bff051d633b51b1857a3e7523207dd17
1 file changed