Merge "Document that SurfaceView is synchronous in N" into nyc-dev
am: 0cfbb7643e

* commit '0cfbb7643ef81cc8d1fd72bfe7c651d0e5e04949':
  Document that SurfaceView is synchronous in N

Change-Id: I508585ec749b0a5d4e241757d655349b09b31566