Treat accessibility gestures like physical ones.

Gestures now operate on the screen as the user sees it, so they are
affected by magnification. This makes gesture coordinates consistent
with the node bounds in screen and makes an eye or head tracking service
work much more easily.

Bug: 27747314
Change-Id: Idee60398d49d8c9af7405d974893c796b034c974
3 files changed