Call setSize to sync Surface to SurfaceFlinger. DO NOT MERGE

RecentsActivity screenshots are called for very quickly after
WindowStateAnimator prepareSurface(). Without enough delay the
Surface.setLayer call does not propagate to the SurfaceFlinger
and the screenshot is incorrect (black) because it stops sampling
the layers too early.

This fix calls Surface.setSize() for each sampled Surface in
screenshots. setSize forces the SurfaceFlinger to process all
transactions queued before returning from closeTransaction.

Bug 7552304 fixed.

Change-Id: I1911dfa0b09cab713c55f5ba0c612496337a77df

Conflicts:

	services/java/com/android/server/wm/WindowManagerService.java