Reland "Input injection: Assume transformed values are i..."

Revert submission 16306432-revert-16295572-ORWQJPYRMQ

Reason for revert: The broken test was fixed in ag/16365181, so
this should be safe to re-land now.

Reverted Changes:
Iab395d41d:Revert "Remove x/y offset from MotionEntry"
I7beca684d:Revert "Input injection: Assume transformed values...

Change-Id: I68b5619bf52d999a653bb246e1acb02f5d07991e