Here, we do two things:
1. To account for the case where the changed the stylus's PointerIcon,
reset the PointerIcon when handwriting is successfully initiated.
2. Inject the handwriting events directly into the InkWindow's view root
instead of dispatching it using the view's dispatchTouchEvent()
method so that things that are handled by the InkView's root will
work as expected, such as setting the pointer icon. This will allow
the InkView to change the PointerIcon using onResolvePointerIcon.
Bug: 275851541
Test: Manual
Change-Id: I97d8d4293a5440a6d6531f279ed7811370671111
0cb1ad008a