Fix two related subtle bugs:
- Stop singling out fat-finger-only corrections for rejection
when touch coordinates are not available.
- Remove a racy check that would happen only in debug mode
Change-Id: Ic904f9b27c091ca6b369052c4e65a630bff81257
This also tries to make the code as easy to extend as possible
for future developments.
Bug: 5701241
Change-Id: I1ed48e6a5cc7aab94c5d6e309930cc004247d7e7