Long press not working if explore by touch and magnification are on.

1. In the magnifier we are caching the touch events until we figure
   out whether the user is triple tapping to enable magnification.
   If the user is not trying to engage magnification we deliver the
   stashed events. However, these events are stale and the subsequent
   transformations such as the touch explorer get confused when trying
   to detect a tap since the delay is longer than the tap slop.
   This change compensates for the time the events were cached
   before sending them to the next transformation in the chain.

bug:7362365

Change-Id: Idd8539ffed7ba4892c5a916bd34910fd2ef50f75