When the magnifier content moves relative to the parent surface,
it will call setPosition on the content surface control. This conflicts
with position updates called by the BlastBufferQueue adapter
causing a flicker on screen. Fix this by providing a wrapper surface
to BlastBufferQueue adapater to send buffer updates.
Fixes: 186072574
Test: Select text and see magnifier surface does not flicker or move
around
Change-Id: Idfcc06a5d90f400f69e5cbe91008a0cb59fd4646
f752c800d3