This patch makes the all `ePointerClick` event dispatcher in C++ code use
`WidgetPointerEvent` instead of `WidgetMouseEvent`.
Then, this patch also makes the all `click` event dispatcher in chrome code use
`PointerEvent` instead of `MouseEvent`. For detecting wrong trusted event
dispatching of `click` event, this patch adds assertion into `MouseEvent`.
Therefore, all chrome test dispatchers also changed to use `PointerEvent`.
Finally, this patch includes a change of a WPT. That checks the `pointerId`
caused by executing an access key. In this case, the value should be `-1`
rather than the default value `0` because Pointer Event spec defines so for
synthetic pointer events caused by non-pointing devices [1]. Chrome also
sets it to `-1` and fails [2]. Therefore, the new assertion will pass on both
Firefox and Chrome.
1. https://w3c.github.io/pointerevents/#dom-pointerevent-pointerid
2. https://wpt.fyi/results/uievents/interface/keyboard-accesskey-click-event.html?run_id=5087897523060736&run_id=5136270464647168&run_id=5163620816388096&run_id=5201281304231936
Differential Revision: https://phabricator.services.mozilla.com/D213001
e1fd41420f