Touch explorer does not perform tap with the right pointer.

The touch explorer was using the id of the last pointer that
went up while injecting up and down to tap through the last
touch explore event incorrectly assuming that the last up
pointer did touch explore. This was leading to a system crash.

bug:5319315

Change-Id: Iffe8ef753795ad685abe6f493cc09adac8bfea94
1 file changed