SurfaceFlinger : Ensure position changes are drawn with correct buffer size

If a single transaction has both positional and size changes, ensure we don't draw
any frames using the incorrect buffer size using the updated position. Wait for the correct
buffer size and then proceed.

RM-232
Change-Id: I8e25f21f17e0936e66bb5053f85f8336c8464c7b
(cherry picked from commit bd41ea35)