Merge "Add accessibility hooks for Preference, provide a11y header info" into nyc-dev am: cb26d0e1ce am: a0e2eb447e
am: 6652cb0284

* commit '6652cb02847bef9b9529e8d9d95d661142d80ad1':

Change-Id: Ice2f6b173787d570576134efbad4040d3aa5b82d