base

put TextureView back to async mode

it's probably not strictly needed, but it guarantees
that the app won't deadlock itself while using a
TextureView -- this could happen if it blocked
in View.onDraw() waiting for the producer

this mimics the behavior TextureView always had.

Change-Id: I453339237a48dea91a10840b8cc0f5d2d84d1520