Only run InputConsumerProxy callback for touch event

The callback exists to ensure the current running animation ends
immediately on touch down, so that we can handle that touch. It
was never intended to run for other events such as HOVER. Updated
to ensure that's the case and also updated documentation/names.

Fixes: 295984940
Test: Manual with animation duration x5:
  - Swipe up followed by HOVER event, ensure animation still plays
  - Swipe to overview, tap on a tile during transition, ensure
    it animates back up
Flag: NONE
Change-Id: I29039ea10154083dcab2e29a97752b18ae8b9331