1. The initial implementation was not sending the gesture start and end
events until the the user has moved more than a given slop and did not
do it faster than a given velocity. However, there is the case where
if the user did not move or just taped on the screen an exploration
occurs. The system was not sending the exploration start and end
events for the latter case.
2. The delaued command for long press was not canceled when the pointer
moves more than the slop distance.
bug:7282811
Change-Id: I7d98470cd4d9ea9b2519326e5e550ff68b040747
f068fed6c4