Fixed a few bugs related to the id-to-index mapping for
pointer coordinates.
Tightened the bounds on the resampling time interval to
avoid predicting too far into the future.
Only lerp X and Y components of motion events.
Alter the future to satisfy past predictions. (Rewrite touch
events to conceal obvious discontinuities.)
Added a system property to control whether resampling is enabled
for debugging purposes.
Bug: 6375101
Change-Id: I35972d63278bc4e78148053a4125ad9abeebfedb
7174a491bc