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

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

Change-Id: I1e4a36d64be663103c3150c86a75e2baa51fa4c4