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

* commit 'cb26d0e1cecf4dc92627cd67c101741799e03a1d':
  Add accessibility hooks for Preference, provide a11y header info

Change-Id: I03c1d66a50b511b58e21f67631da979744e1dc86