am 27a2b50d: Add a hidden API to modify the paint used to draw gestures.

Merge commit '27a2b50dedd4315b921d502a30ac0fda51fb6a7c'

* commit '27a2b50dedd4315b921d502a30ac0fda51fb6a7c':
  Add a hidden API to modify the paint used to draw gestures.