Increase time interval in points provided to VelocityTracker

There are cases where motion events arrive at VelocityTracker very close
together in time (~1 ms), even though they are generated by hardware with
much more time between then (~10 ms).  In these cases, VelocityTracker can
be tweaked to treat these points with more time between them, to prevent
wildly incorrect velocities from being calculated.

Tweak the CTS test case to validate VelocityTracker with more realistic
time deltas between points.

Change-Id: I35137ad4ca6223aee0cbba5650672a04f7cea831