This implements just enough of [Touch Events](http://w3c.github.io/touch-events/) to enable scrolling on Android without regressing basic single-touch interaction like clicking on links.
Dragging a page will scroll it, unless the page calls `preventDefault` on the "touchstart" event.
Does **not** yet support pinch zooming or other multi-touch gestures or events.
Includes a `-Z convert-mouse-to-touch` command line flag for testing on non-touch platforms. This is also enabled by default on Android because Glutin currently translates touch input to mouse events on Android.
Source-Repo: https://github.com/servo/servo
Source-Revision: dcd207f9bf15c9ecf5d043385ba93277e69201f6
